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[2.0.66] Slow Multiplayer Map Download Speeds

https://forums.factorio.com/viewtopic.php?t=131104

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[2.0.66] Slow Multiplayer Map Download Speeds

Posted: Mon Sep 29, 2025 5:28 pm
by BenTechy66
I'm facing incredibly slow map download speeds when connecting to any multiplayer server (I have tested against various on the public server list and my own dedicated server), peaking at around 400kB/s:
09-29-2025, 18-24-59.png
09-29-2025, 18-24-59.png (20.86 KiB) Viewed 481 times
My connection speed to the server doesn't appear to be at issue when running non-factorio tests:
09-29-2025, 18-26-46.png
09-29-2025, 18-26-46.png (23.01 KiB) Viewed 481 times
09-29-2025, 18-27-21.png
09-29-2025, 18-27-21.png (32.58 KiB) Viewed 481 times
Additionally, a friend of mine is getting at least 1mb/sec download, so the issue likely lies somewhere along my network. I've tested from another machine on the same network (via WiFi and Ethernet) and it is also capped at 400kb/s.

Ping to the server is stable at around 15ms. I have the firewall disabled.

The log file doesn't appear include anything relevant:

Code: Select all

   0.000 2025-09-29 18:24:01; Factorio 2.0.66 (build 83840, win64, steam, space-age)
   0.000 Operating system: Windows 11 (build 26100) 
   0.000 Initializing Steam API.
   0.000 Program arguments: "C:\Program Files (x86)\Steam\steamapps\common\Factorio\bin\x64\Factorio.exe" 
   0.000 Config path: C:/Users/sendb/AppData/Roaming/Factorio/config/config.ini
   0.000 Read data path: C:/Program Files (x86)/Steam/steamapps/common/Factorio/data
   0.000 Write data path: C:/Users/sendb/AppData/Roaming/Factorio [57997/1907015MB]
   0.000 Binaries path: C:/Program Files (x86)/Steam/steamapps/common/Factorio/bin
   0.006 System info: [CPU: AMD Ryzen 9 7950X 16-Core Processor, 32 cores, RAM: 14424/32501 MB, page: 17163/34549 MB, virtual: 4356/134217727 MB, extended virtual: 0 MB]
   0.046 Memory info:
   0.046  [0]: Unknown CMH32GX5M2B6000Z30 16384 MB 6000 MHz 1.1 v 64|64
   0.046  [1]: Unknown CMH32GX5M2B6000Z30 16384 MB 6000 MHz 1.1 v 64|64
   0.195 Info ModManager.cpp:278: Found duplicate mod Milestones, using highest version (1.4.6).
   0.195 Info ModManager.cpp:278: Found duplicate mod flib, using highest version (0.16.3).
   0.195 Info ModManager.cpp:278: Found duplicate mod space-exploration, using highest version (0.7.32).
   0.195 Info ModManager.cpp:278: Found duplicate mod space-exploration-postprocess, using highest version (0.7.3).
   0.195 Display options: [FullScreen: true] [VSync: true] [UIScale: automatic (100.0%)] [Native DPI: true] [Screen: 255] [Special: lmw] [Lang: en]
   0.476 Video driver: windows
   0.476 Available displays: 2
   0.476  [0]: \\.\DISPLAY1 - NVIDIA GeForce RTX 4070 Ti {0x05, [0,0], 1920x1080, 32bit, 60Hz}
   0.476  [1]: \\.\DISPLAY2 - NVIDIA GeForce RTX 4070 Ti {0x01, [-1920,0], 1920x1080, 32bit, 60Hz}
   0.515 [Direct3D11] Display: 0, Output: 0, DisplayAdapter: 0, RenderingAdapter: -1; d3dcompiler_47.dll
   0.662 Initialised Direct3D[0]: NVIDIA GeForce RTX 4070 Ti; id: 10de-2782; driver: nvldumdx.dll 32.0.15.6094
   0.662   D3D Feature Level: 11.1, DXGI 1.5+, SwapChain: 3,flip-discard,-,-,-,none
   0.662   [Local Video Memory] Budget: 11228MB, CurrentUsage: 7MB, Reservation: 0/5742MB
   0.662   [Non-Local Vid.Mem.] Budget: 15482MB, CurrentUsage: 0MB, Reservation: 0/7869MB
   0.662   Tiled resources: Tier 2
   0.662   Unified Memory Architecture: No
   0.662   BGR 565 Supported: Yes
   0.662   MaximumFrameLatency: 3, GPUThreadPriority: 0
   0.662 Graphics settings preset: very-high
   0.662   Dedicated video memory size 11996 MB
   0.683 Desktop composition is active.
   0.684 Graphics options: [Graphics quality: high] [Video memory usage: all] [DXT: high-quality]
   0.684                   [Max threads (load/render): 32/8] [Max texture size: 0] [Tex.Stream.: false] [Rotation quality: normal] [Other: STDCWTl] [B:0,C:0,S:100]
   0.698 [Audio] Driver:wasapi, Device:Default device, Depth:16, Frequency:44100, Channels:2, Interpolation:linear
   0.766 Info ModManager.cpp:444: FeatureFlag expansion-shaders = false
   0.766 Info ModManager.cpp:444: FeatureFlag freezing = false
   0.766 Info ModManager.cpp:444: FeatureFlag quality = false
   0.766 Info ModManager.cpp:444: FeatureFlag rail-bridges = false
   0.766 Info ModManager.cpp:444: FeatureFlag segmented-units = false
   0.766 Info ModManager.cpp:444: FeatureFlag space-travel = false
   0.766 Info ModManager.cpp:444: FeatureFlag spoiling = false
   0.767 Loading mod settings belt-visualizer 2.0.2 (settings.lua)
   0.768 Loading mod settings aai-containers 0.3.2 (settings.lua)
   0.768 Loading mod settings DiscoScience 2.0.1 (settings.lua)
   0.768 Loading mod settings FactorySearch 1.14.0 (settings.lua)
   0.768 Loading mod settings informatron 0.4.0 (settings.lua)
   0.768 Loading mod settings jetpack 0.4.13 (settings.lua)
   0.768 Loading mod settings rec-blue-plus 1.4.8 (settings.lua)
   0.768 Loading mod settings robot_attrition 0.6.4 (settings.lua)
   0.768 Loading mod settings space-exploration-menu-simulations 0.7.4 (settings.lua)
   0.769 Loading mod settings Todo-List 19.13.0 (settings.lua)
   0.769 Loading mod settings aai-industry 0.6.11 (settings.lua)
   0.769 Loading mod settings alien-biomes 0.7.4 (settings.lua)
   0.769 Loading mod settings equipment-gantry 0.2.3 (settings.lua)
   0.769 Loading mod settings Milestones 1.4.6 (settings.lua)
   0.769 Loading mod settings RecipeBook 4.0.6 (settings.lua)
   0.770 Loading mod settings UPSFriendlyNixieTubeDisplay 0.2.9 (settings.lua)
   0.770 Loading mod settings space-exploration 0.7.32 (settings.lua)
   0.770 Loading mod settings EditorExtensions 2.5.0 (settings.lua)
   0.771 Loading mod settings rocket-log 2.0.1 (settings.lua)
   0.771 Loading mod settings se-space-trains 1.0.9 (settings.lua)
   0.771 Loading mod settings space-exploration-postprocess 0.7.3 (settings.lua)
   0.772 Loading mod settings BottleneckLite 1.3.4 (settings.lua)
   0.775 Loading mod core 0.0.0 (data.lua)
   0.788 Loading mod base 2.0.66 (data.lua)
   0.914 Loading mod belt-visualizer 2.0.2 (data.lua)
   0.920 Loading mod aai-containers 0.3.2 (data.lua)
   0.927 Loading mod aai-signal-transmission 0.5.3 (data.lua)
   0.932 Loading mod aai-signals 0.7.1 (data.lua)
   0.936 Loading mod Better-TrainHorn 1.0.3 (data.lua)
   0.940 Loading mod DiscoScience 2.0.1 (data.lua)
   0.945 Loading mod FactorySearch 1.14.0 (data.lua)
   0.950 Loading mod flib 0.16.3 (data.lua)
   0.968 Loading mod informatron 0.4.0 (data.lua)
   0.972 Loading mod jetpack 0.4.13 (data.lua)
   0.978 Loading mod pushbutton 2.0.5 (data.lua)
   0.984 Loading mod rec-blue-plus 1.4.8 (data.lua)
   0.997 Loading mod robot_attrition 0.6.4 (data.lua)
   1.000 Loading mod shield-projector 0.2.2 (data.lua)
   1.013 Loading mod space-exploration-menu-simulations 0.7.4 (data.lua)
   1.018 Loading mod textplates 0.7.2 (data.lua)
   1.037 Loading mod Todo-List 19.13.0 (data.lua)
   1.043 Loading mod aai-industry 0.6.11 (data.lua)
   1.043 Script @__aai-industry__/data.lua:2: Log mods once: {
  ["Better-TrainHorn"] = "1.0.3",
  BottleneckLite = "1.3.4",
  ChangeInserterDropLane = "1.1.0",
  CleanFloor = "2.0.0",
  DiscoScience = "2.0.1",
  EditorExtensions = "2.5.0",
  FactorySearch = "1.14.0",
  Milestones = "1.4.6",
  RecipeBook = "4.0.6",
  ["Todo-List"] = "19.13.0",
  UPSFriendlyNixieTubeDisplay = "0.2.9",
  ["aai-containers"] = "0.3.2",
  ["aai-industry"] = "0.6.11",
  ["aai-signal-transmission"] = "0.5.3",
  ["aai-signals"] = "0.7.1",
  ["alien-biomes"] = "0.7.4",
  ["alien-biomes-graphics"] = "0.7.1",
  base = "2.0.66",
  ["belt-visualizer"] = "2.0.2",
  ["better-victory-screen"] = "1.0.0",
  bplib = "1.1.3",
  ["equipment-gantry"] = "0.2.3",
  factoryplanner = "2.0.36",
  flib = "0.16.3",
  informatron = "0.4.0",
  jetpack = "0.4.13",
  pushbutton = "2.0.5",
  ["rec-blue-plus"] = "1.4.8",
  robot_attrition = "0.6.4",
  ["rocket-log"] = "2.0.1",
  ["se-space-trains"] = "1.0.9",
  ["shield-projector"] = "0.2.2",
  ["space-exploration"] = "0.7.32",
  ["space-exploration-graphics"] = "0.7.5",
  ["space-exploration-graphics-2"] = "0.7.2",
  ["space-exploration-graphics-3"] = "0.7.2",
  ["space-exploration-graphics-4"] = "0.7.2",
  ["space-exploration-graphics-5"] = "0.7.2",
  ["space-exploration-menu-simulations"] = "0.7.4",
  ["space-exploration-postprocess"] = "0.7.3",
  textplates = "0.7.2"
}
   1.058 Loading mod alien-biomes 0.7.4 (data.lua)
   1.121 Script @__alien-biomes__/prototypes/entity/trees.lua:47: Disabling tree tree-01
   1.121 Script @__alien-biomes__/prototypes/entity/trees.lua:47: Disabling tree tree-02
   1.121 Script @__alien-biomes__/prototypes/entity/trees.lua:47: Disabling tree tree-02-red
   1.121 Script @__alien-biomes__/prototypes/entity/trees.lua:47: Disabling tree tree-03
   1.121 Script @__alien-biomes__/prototypes/entity/trees.lua:47: Disabling tree tree-04
   1.121 Script @__alien-biomes__/prototypes/entity/trees.lua:47: Disabling tree tree-05
   1.121 Script @__alien-biomes__/prototypes/entity/trees.lua:47: Disabling tree tree-06
   1.121 Script @__alien-biomes__/prototypes/entity/trees.lua:47: Disabling tree tree-06-brown
   1.121 Script @__alien-biomes__/prototypes/entity/trees.lua:47: Disabling tree tree-07
   1.121 Script @__alien-biomes__/prototypes/entity/trees.lua:47: Disabling tree tree-08
   1.121 Script @__alien-biomes__/prototypes/entity/trees.lua:47: Disabling tree tree-08-brown
   1.121 Script @__alien-biomes__/prototypes/entity/trees.lua:47: Disabling tree tree-08-red
   1.121 Script @__alien-biomes__/prototypes/entity/trees.lua:47: Disabling tree tree-09
   1.121 Script @__alien-biomes__/prototypes/entity/trees.lua:47: Disabling tree tree-09-brown
   1.121 Script @__alien-biomes__/prototypes/entity/trees.lua:47: Disabling tree tree-09-red
   1.121 Script @__alien-biomes__/prototypes/entity/trees.lua:47: Disabling tree dry-tree
   1.121 Script @__alien-biomes__/prototypes/entity/trees.lua:47: Disabling tree dead-tree-desert
   1.121 Script @__alien-biomes__/prototypes/entity/trees.lua:47: Disabling tree dead-grey-trunk
   1.121 Script @__alien-biomes__/prototypes/entity/trees.lua:47: Disabling tree dead-dry-hairy-tree
   1.121 Script @__alien-biomes__/prototypes/entity/trees.lua:47: Disabling tree dry-hairy-tree
   1.153 Loading mod ChangeInserterDropLane 1.1.0 (data.lua)
   1.160 Loading mod equipment-gantry 0.2.3 (data.lua)
   1.168 Loading mod factoryplanner 2.0.36 (data.lua)
   1.176 Loading mod Milestones 1.4.6 (data.lua)
   1.184 Loading mod RecipeBook 4.0.6 (data.lua)
   1.192 Loading mod UPSFriendlyNixieTubeDisplay 0.2.9 (data.lua)
   1.202 Loading mod space-exploration 0.7.32 (data.lua)
   1.293 Loading mod EditorExtensions 2.5.0 (data.lua)
   1.312 Loading mod rocket-log 2.0.1 (data.lua)
   1.322 Loading mod se-space-trains 1.0.9 (data.lua)
   1.335 Loading mod base 2.0.66 (data-updates.lua)
   1.346 Loading mod CleanFloor 2.0.0 (data-updates.lua)
   1.356 Loading mod FactorySearch 1.14.0 (data-updates.lua)
   1.365 Loading mod textplates 0.7.2 (data-updates.lua)
   1.375 Loading mod aai-industry 0.6.11 (data-updates.lua)
   1.389 Loading mod alien-biomes 0.7.4 (data-updates.lua)
   1.398 Loading mod ChangeInserterDropLane 1.1.0 (data-updates.lua)
   1.408 Loading mod space-exploration 0.7.32 (data-updates.lua)
   1.428 Loading mod se-space-trains 1.0.9 (data-updates.lua)
   1.440 Loading mod aai-containers 0.3.2 (data-final-fixes.lua)
   1.450 Loading mod jetpack 0.4.13 (data-final-fixes.lua)
   1.462 Loading mod robot_attrition 0.6.4 (data-final-fixes.lua)
   1.472 Loading mod aai-industry 0.6.11 (data-final-fixes.lua)
   1.486 Loading mod alien-biomes 0.7.4 (data-final-fixes.lua)
   1.505 Script @__alien-biomes__/data-final-fixes.lua:204: Setting decals to layer 246
   1.515 Loading mod space-exploration 0.7.32 (data-final-fixes.lua)
   1.594 Script @__space-exploration__/prototypes/phase-3/resources.lua:43: Resource can place: iron-ore
   1.594 Script @__space-exploration__/prototypes/phase-3/resources.lua:43: Resource can place: copper-ore
   1.594 Script @__space-exploration__/prototypes/phase-3/resources.lua:43: Resource can place: coal
   1.594 Script @__space-exploration__/prototypes/phase-3/resources.lua:43: Resource can place: stone
   1.594 Script @__space-exploration__/prototypes/phase-3/resources.lua:43: Resource can place: uranium-ore
   1.594 Script @__space-exploration__/prototypes/phase-3/resources.lua:43: Resource can place: crude-oil
   1.594 Script @__space-exploration__/prototypes/phase-3/resources.lua:43: Resource can place: se-water-ice
   1.594 Script @__space-exploration__/prototypes/phase-3/resources.lua:43: Resource can place: se-methane-ice
   1.594 Script @__space-exploration__/prototypes/phase-3/resources.lua:43: Resource can place: se-beryllium-ore
   1.594 Script @__space-exploration__/prototypes/phase-3/resources.lua:43: Resource can place: se-cryonite
   1.594 Script @__space-exploration__/prototypes/phase-3/resources.lua:43: Resource can place: se-holmium-ore
   1.594 Script @__space-exploration__/prototypes/phase-3/resources.lua:43: Resource can place: se-iridium-ore
   1.594 Script @__space-exploration__/prototypes/phase-3/resources.lua:43: Resource can place: se-naquium-ore
   1.594 Script @__space-exploration__/prototypes/phase-3/resources.lua:43: Resource can place: se-vulcanite
   1.594 Script @__space-exploration__/prototypes/phase-3/resources.lua:43: Resource can place: se-vitamelange
   1.599 Script @__space-exploration__/data-final-fixes.lua:90: Orphaned recipe: pistol
   1.599 Script @__space-exploration__/data-final-fixes.lua:90: Orphaned recipe: loader
   1.599 Script @__space-exploration__/data-final-fixes.lua:90: Orphaned recipe: fast-loader
   1.599 Script @__space-exploration__/data-final-fixes.lua:90: Orphaned recipe: express-loader
   1.599 Script @__space-exploration__/data-final-fixes.lua:90: Orphaned recipe: equipment-gantry-insert
   1.599 Script @__space-exploration__/data-final-fixes.lua:90: Orphaned recipe: equipment-gantry-remove
   1.599 Script @__space-exploration__/data-final-fixes.lua:90: Orphaned recipe: se-rocket-launch-pad-silo-dummy-recipe
   1.599 Script @__space-exploration__/data-final-fixes.lua:90: Orphaned recipe: se-iridium-piledriver
   1.599 Script @__space-exploration__/data-final-fixes.lua:90: Orphaned recipe: se-space-probe-rocket-deploy
   1.599 Script @__space-exploration__/data-final-fixes.lua:90: Orphaned recipe: ee-infinity-accumulator
   1.599 Script @__space-exploration__/data-final-fixes.lua:90: Orphaned recipe: ee-infinity-cargo-wagon
   1.599 Script @__space-exploration__/data-final-fixes.lua:90: Orphaned recipe: ee-infinity-fluid-wagon
   1.599 Script @__space-exploration__/data-final-fixes.lua:90: Orphaned recipe: ee-infinity-fission-reactor-equipment
   1.599 Script @__space-exploration__/data-final-fixes.lua:90: Orphaned recipe: ee-infinity-heat-pipe
   1.599 Script @__space-exploration__/data-final-fixes.lua:90: Orphaned recipe: ee-infinity-loader
   1.599 Script @__space-exploration__/data-final-fixes.lua:90: Orphaned recipe: ee-infinity-pipe
   1.599 Script @__space-exploration__/data-final-fixes.lua:90: Orphaned recipe: ee-linked-belt
   1.599 Script @__space-exploration__/data-final-fixes.lua:90: Orphaned recipe: ee-linked-chest
   1.599 Script @__space-exploration__/data-final-fixes.lua:90: Orphaned recipe: ee-super-battery-equipment
   1.599 Script @__space-exploration__/data-final-fixes.lua:90: Orphaned recipe: ee-super-beacon
   1.599 Script @__space-exploration__/data-final-fixes.lua:90: Orphaned recipe: ee-super-construction-robot
   1.599 Script @__space-exploration__/data-final-fixes.lua:90: Orphaned recipe: ee-super-electric-pole
   1.599 Script @__space-exploration__/data-final-fixes.lua:90: Orphaned recipe: ee-super-energy-shield-equipment
   1.599 Script @__space-exploration__/data-final-fixes.lua:90: Orphaned recipe: ee-super-exoskeleton-equipment
   1.599 Script @__space-exploration__/data-final-fixes.lua:90: Orphaned recipe: ee-super-fuel
   1.599 Script @__space-exploration__/data-final-fixes.lua:90: Orphaned recipe: ee-super-inserter
   1.599 Script @__space-exploration__/data-final-fixes.lua:90: Orphaned recipe: ee-super-lab
   1.599 Script @__space-exploration__/data-final-fixes.lua:90: Orphaned recipe: ee-super-locomotive
   1.599 Script @__space-exploration__/data-final-fixes.lua:90: Orphaned recipe: ee-super-logistic-robot
   1.599 Script @__space-exploration__/data-final-fixes.lua:90: Orphaned recipe: ee-super-night-vision-equipment
   1.599 Script @__space-exploration__/data-final-fixes.lua:90: Orphaned recipe: ee-super-personal-roboport-equipment
   1.599 Script @__space-exploration__/data-final-fixes.lua:90: Orphaned recipe: ee-super-pump
   1.599 Script @__space-exploration__/data-final-fixes.lua:90: Orphaned recipe: ee-super-radar
   1.599 Script @__space-exploration__/data-final-fixes.lua:90: Orphaned recipe: ee-super-roboport
   1.599 Script @__space-exploration__/data-final-fixes.lua:90: Orphaned recipe: ee-super-substation
   1.599 Script @__space-exploration__/data-final-fixes.lua:90: Orphaned recipe: ee-infinity-chest
   1.599 Script @__space-exploration__/data-final-fixes.lua:90: Orphaned recipe: ee-infinity-chest-active-provider
   1.599 Script @__space-exploration__/data-final-fixes.lua:90: Orphaned recipe: ee-infinity-chest-passive-provider
   1.599 Script @__space-exploration__/data-final-fixes.lua:90: Orphaned recipe: ee-infinity-chest-storage
   1.599 Script @__space-exploration__/data-final-fixes.lua:90: Orphaned recipe: ee-infinity-chest-buffer
   1.599 Script @__space-exploration__/data-final-fixes.lua:90: Orphaned recipe: ee-infinity-chest-requester
   1.600 Script @__space-exploration__/data-final-fixes.lua:90: Orphaned recipe: ee-aggregate-chest
   1.600 Script @__space-exploration__/data-final-fixes.lua:90: Orphaned recipe: ee-aggregate-chest-passive-provider
   1.600 Script @__space-exploration__/data-final-fixes.lua:90: Orphaned recipe: ee-super-speed-module
   1.600 Script @__space-exploration__/data-final-fixes.lua:90: Orphaned recipe: ee-super-efficiency-module
   1.600 Script @__space-exploration__/data-final-fixes.lua:90: Orphaned recipe: ee-super-productivity-module
   1.600 Script @__space-exploration__/data-final-fixes.lua:90: Orphaned recipe: ee-super-clean-module
   1.600 Script @__space-exploration__/data-final-fixes.lua:90: Orphaned recipe: ee-super-slow-module
   1.600 Script @__space-exploration__/data-final-fixes.lua:90: Orphaned recipe: ee-super-inefficiency-module
   1.600 Script @__space-exploration__/data-final-fixes.lua:90: Orphaned recipe: ee-super-dirty-module
   1.611 Loading mod EditorExtensions 2.5.0 (data-final-fixes.lua)
   1.622 Loading mod space-exploration-postprocess 0.7.3 (data-final-fixes.lua)
   1.753 Loading mod BottleneckLite 1.3.4 (data-final-fixes.lua)
   1.853 Checksum for core: 2271245941
   1.853 Checksum of base: 1151377329
   1.853 Checksum of belt-visualizer: 1844300500
   1.853 Checksum of CleanFloor: 2254551355
   1.853 Checksum of aai-containers: 654097962
   1.853 Checksum of aai-signal-transmission: 1896625553
   1.853 Checksum of aai-signals: 3732766133
   1.853 Checksum of alien-biomes-graphics: 0
   1.853 Checksum of Better-TrainHorn: 2050923184
   1.853 Checksum of better-victory-screen: 0
   1.853 Checksum of bplib: 0
   1.853 Checksum of DiscoScience: 2800209080
   1.853 Checksum of FactorySearch: 2061526368
   1.853 Checksum of flib: 728527376
   1.853 Checksum of informatron: 1824090339
   1.853 Checksum of jetpack: 2841393122
   1.853 Checksum of pushbutton: 3403350918
   1.853 Checksum of rec-blue-plus: 1199449279
   1.853 Checksum of robot_attrition: 3498899947
   1.853 Checksum of shield-projector: 4058400129
   1.853 Checksum of space-exploration-graphics: 0
   1.853 Checksum of space-exploration-graphics-2: 0
   1.853 Checksum of space-exploration-graphics-3: 0
   1.853 Checksum of space-exploration-graphics-4: 0
   1.853 Checksum of space-exploration-graphics-5: 0
   1.853 Checksum of space-exploration-menu-simulations: 982088517
   1.853 Checksum of textplates: 1586580192
   1.853 Checksum of Todo-List: 1238941826
   1.853 Checksum of aai-industry: 2403657442
   1.853 Checksum of alien-biomes: 4229516688
   1.853 Checksum of ChangeInserterDropLane: 154718258
   1.853 Checksum of equipment-gantry: 1577319214
   1.853 Checksum of factoryplanner: 3898654475
   1.853 Checksum of Milestones: 3738671663
   1.853 Checksum of RecipeBook: 581756427
   1.853 Checksum of UPSFriendlyNixieTubeDisplay: 4102207480
   1.853 Checksum of space-exploration: 198126546
   1.853 Checksum of EditorExtensions: 3946077640
   1.853 Checksum of rocket-log: 3320450392
   1.853 Checksum of se-space-trains: 1029835477
   1.853 Checksum of space-exploration-postprocess: 1614723056
   1.853 Checksum of BottleneckLite: 1532780317
   2.162 Prototype list checksum: 1356905926
   2.218 Loading sounds...
   2.415 Info PlayerData.cpp:66: Local player-data.json unavailable
   2.415 Info PlayerData.cpp:69: Cloud player-data.json available, timestamp 1759156001
   2.417 Post-data load graphics options: [Light occlusion: no]
   2.662 Initial atlas bitmap size is 16384
   2.667 Created an atlas bitmap (size 16384x16380) [none]
   2.671 Created an atlas bitmap (size 16384x16312) [none]
   2.678 Created an atlas bitmap (size 16384x16376) [none]
   2.693 Created an atlas bitmap (size 16384x16380) [none]
   2.694 Created an atlas bitmap (size 16384x8644) [none]
   2.696 Created an atlas bitmap (size 16384x16384) [low-object]
   2.697 Created an atlas bitmap (size 4096x1952) [low-object]
   2.697 Created an atlas bitmap (size 16384x12092) [corpse-decay]
   2.697 Created an atlas bitmap (size 16384x5336) [decal]
   2.698 Created an atlas bitmap (size 16384x5152) [mipmap, linear-minification, linear-magnification, linear-mip-level]
   2.698 Created an atlas bitmap (size 4096x1632) [smoke, mipmap, linear-minification, linear-magnification]
   2.701 Created an atlas bitmap (size 16384x16352) [terrain, mipmap, linear-minification, linear-mip-level]
   2.701 Created an atlas bitmap (size 16384x7168) [terrain, mipmap, linear-minification, linear-mip-level]
   2.701 Created an atlas bitmap (size 4096x3152) [terrain-effect-map, mipmap, linear-minification, linear-mip-level]
   2.701 Created an atlas bitmap (size 8192x3024) [mipmap]
   2.702 Created an atlas bitmap (size 8192x6496) [icon, not-compressed, mipmap, linear-minification, linear-magnification, linear-mip-level]
   2.702 Created an atlas bitmap (size 16384x3536) [alpha-mask]
   2.707 Created an atlas bitmap (size 16384x16352) [shadow, linear-magnification, alpha-mask]
   2.713 Created an atlas bitmap (size 16384x16384) [shadow, linear-magnification, alpha-mask]
   2.713 Created an atlas bitmap (size 16384x9112) [shadow, linear-magnification, alpha-mask]
   2.713 Created an atlas bitmap (size 16384x3712) [shadow, mipmap, linear-magnification, alpha-mask]
   2.713 Created an atlas bitmap (size 4096x592) [icon-background, not-compressed, mipmap, linear-minification, linear-magnification, linear-mip-level, ]
   2.713 Loading 3D bitmaps.
   2.718 Texture processor created (4096). GPU accelerated compression Supported: yes, Enabled: yes/yes. Test passed. YCoCgDXT PSNR: 35.83, BC3 PSNR: 33.82
   3.698 Atlases loaded from disk cache in 0.980748 seconds.
   3.702 Parallel sprite loader initialized (threads: 30, bitmaps: 6)
   4.655 Sprites loaded
   4.667 Generated mipmaps (4) for atlas [5] of size 16384x16384   
   4.678 Generated mipmaps (4) for atlas [6] of size 4096x1952   
   4.688 Generated mipmaps (3) for atlas [9] of size 16384x5152   
   4.699 Generated mipmaps (3) for atlas [10] of size 4096x1632   
   4.710 Generated mipmaps (3) for atlas [11] of size 16384x16352   
   4.721 Generated mipmaps (3) for atlas [12] of size 16384x7168   
   4.733 Generated mipmaps (3) for atlas [13] of size 4096x3152   
   4.771 Generated mipmaps (3) for atlas [14] of size 8192x3024   
   4.782 Generated mipmaps (5) for atlas [15] of size 8192x6496   
   4.793 Generated mipmaps (3) for atlas [20] of size 16384x3712   
   4.807 Custom mipmaps uploaded (2707)
   4.825 Video memory usage: 3658.72 MB (Atlases: 3646.49 MB, Textures: 12.23 MB)
   4.828 Custom inputs active: 68
   5.047 Factorio initialised
   5.062 Steam Storage Quota: 18030/23841
  17.486 Joining game IP ADDR:({redact:34197})
  17.486 Info UDPSocket.cpp:43: Opening socket
  17.487 Info ClientMultiplayerManager.cpp:608: UpdateTick(18446744073709551615) changing state from(Ready) to(Connecting)
  17.600 Connection refused
  17.600 Info ClientMultiplayerManager.cpp:199: Quitting multiplayer connection.
  17.600 Info ClientMultiplayerManager.cpp:608: UpdateTick(18446744073709551615) changing state from(Connecting) to(Disconnected)
  17.602 Info HttpSharedState.cpp:57: Downloading https://auth.factorio.com/generate-user-server-key-2?api_version=6
  17.960 Info AuthServerConnector.cpp:149: Received key from auth server.
  17.960 Info UDPSocket.cpp:237: Closing socket
  17.960 Info UDPSocket.cpp:267: Socket closed
  17.960 Joining game IP ADDR:({redact:34197})
  17.960 Info UDPSocket.cpp:43: Opening socket
  17.960 Info ClientMultiplayerManager.cpp:608: UpdateTick(18446744073709551615) changing state from(Ready) to(Connecting)
  18.048 Info ClientSynchronizer.cpp:27: Initialized Synchronizer local peer(1) latency(32).
  18.049 Info ClientMultiplayerManager.cpp:608: UpdateTick(18446744073709551615) changing state from(Connecting) to(ConnectedWaitingForMap)
  18.049 Info ClientRouter.cpp:228: ConnectionAccepted
  25.999 Info ClientMultiplayerManager.cpp:747: Received mapReadyForDownload
  25.999 Downloading file C:\Users\sendb\AppData\Roaming\Factorio\temp\mp-download.zip (133196570 B, auxiliary 85 B, 264806 blocks)
  26.012 Info ClientMultiplayerManager.cpp:608: UpdateTick(18446744073709551615) changing state from(ConnectedWaitingForMap) to(ConnectedDownloadingMap)
  52.580 Info ClientMultiplayerManager.cpp:138: Disconnecting multiplayer connection. Reason: Quit.
  52.580 Info ClientMultiplayerManager.cpp:608: UpdateTick(18446744073709551615) changing state from(ConnectedDownloadingMap) to(DisconnectScheduled)
  52.583 Info ClientMultiplayerManager.cpp:608: UpdateTick(18446744073709551615) changing state from(DisconnectScheduled) to(WaitingForDisconnectConfirmation)
  52.666 Info ClientMultiplayerManager.cpp:608: UpdateTick(18446744073709551615) changing state from(WaitingForDisconnectConfirmation) to(Disconnected)
  52.666 Info ClientMultiplayerManager.cpp:874: Disconnect notification for peer (8)
  52.666 Info ClientSynchronizer.cpp:220: nextHeartbeatSequenceNumber(87767692) cannot process synchronizer action(MapDownloadingProgressUpdate)
  52.669 Info UDPSocket.cpp:237: Closing socket
  52.669 Info UDPSocket.cpp:267: Socket closed
  66.103 Script @__space-exploration__/scripts/migrate.lua:274: space-exploration: Starting migrations from 0.7.19 to 0.7.32 (simulation)
  66.103 Script @__space-exploration__/scripts/migrate.lua:281: space-exploration: Running migration 0.7.20
  66.105 Script @__space-exploration__/scripts/migrate.lua:281: space-exploration: Running migration 0.7.28
  66.115 Script @__space-exploration__/scripts/migrate.lua:281: space-exploration: Running migration 0.7.30
  96.536 Script @__space-exploration__/scripts/migrate.lua:274: space-exploration: Starting migrations from 0.7.19 to 0.7.32 (simulation)
  96.536 Script @__space-exploration__/scripts/migrate.lua:281: space-exploration: Running migration 0.7.20
  96.538 Script @__space-exploration__/scripts/migrate.lua:281: space-exploration: Running migration 0.7.28
  96.544 Script @__space-exploration__/scripts/migrate.lua:281: space-exploration: Running migration 0.7.30
 156.935 Script @__space-exploration__/scripts/migrate.lua:274: space-exploration: Starting migrations from 0.7.19 to 0.7.32 (simulation)
 156.935 Script @__space-exploration__/scripts/migrate.lua:281: space-exploration: Running migration 0.7.20
 156.937 Script @__space-exploration__/scripts/migrate.lua:281: space-exploration: Running migration 0.7.28
 156.943 Script @__space-exploration__/scripts/migrate.lua:281: space-exploration: Running migration 0.7.30
 193.301 Script @__space-exploration__/scripts/migrate.lua:274: space-exploration: Starting migrations from 0.7.19 to 0.7.32 (simulation)
 193.301 Script @__space-exploration__/scripts/migrate.lua:281: space-exploration: Running migration 0.7.20
 193.304 Script @__space-exploration__/scripts/migrate.lua:281: space-exploration: Running migration 0.7.28
 193.316 Script @__space-exploration__/scripts/migrate.lua:281: space-exploration: Running migration 0.7.30

Re: [2.0.66] Slow Multiplayer Map Download Speeds

Posted: Mon Sep 29, 2025 6:06 pm
by Loewchen
Looks like a case of high packet loss, in the past this has been caused by a firewall interpreting the map download as UDP flood attack.

Re: [2.0.66] Slow Multiplayer Map Download Speeds

Posted: Mon Sep 29, 2025 6:09 pm
by BenTechy66
Loewchen wrote: Mon Sep 29, 2025 6:06 pm Looks like a case of high packet loss, in the past this has been caused by a firewall interpreting the map download as UDP flood attack.
Interesting, it definitely could be that but I disabled the firewall on my router and it made no difference to download speed - could there be something further along the pipeline causing issues? My host-based firewall is also off (although the issue presented itself on two different hosts, one macos and one Windows).

Re: [2.0.66] Slow Multiplayer Map Download Speeds

Posted: Tue Sep 30, 2025 2:37 pm
by BenTechy66
Have tried from a separate network, no issues there. No other UDP application seems to have this issue on my home network, so I'm curious why Factorio specifically is triggering this behaviour

Re: [2.0.66] Slow Multiplayer Map Download Speeds

Posted: Tue Sep 30, 2025 3:58 pm
by Loewchen
BenTechy66 wrote: Tue Sep 30, 2025 2:37 pm No other UDP application seems to have this issue on my home network, so I'm curious why Factorio specifically is triggering this behaviour
But doesn't your second iperf picture show 72% packet loss as well or am I misreading it?
For the games I play in multiplayer factorio is the only one that uses UDP for map download, others use it only for the latency sensitive updates. I don't know if that's anecdotal but if factorio is an outlier it explains why a complete saturation of the network with UDP packets is considered suspicious.

Re: [2.0.66] Slow Multiplayer Map Download Speeds

Posted: Thu Oct 02, 2025 9:37 am
by BenTechy66
Loewchen wrote: Tue Sep 30, 2025 3:58 pm
BenTechy66 wrote: Tue Sep 30, 2025 2:37 pm No other UDP application seems to have this issue on my home network, so I'm curious why Factorio specifically is triggering this behaviour
But doesn't your second iperf picture show 72% packet loss as well or am I misreading it?
For the games I play in multiplayer factorio is the only one that uses UDP for map download, others use it only for the latency sensitive updates. I don't know if that's anecdotal but if factorio is an outlier it explains why a complete saturation of the network with UDP packets is considered suspicious.
Apologies, you're quite right - I had somehow missed that. I suppose I will need to call up my ISP and get them to fix something?
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