[0.15.30] Weird FPS drops

[Mimos]

Hi,

I was trying to play with a friend, me being the server. I loaded up our old savegame and he connected. We both had good UPS (mostly 60) but only I had good FPS, he normally had about 20 with factorio barely reacting to inputs. Sometimes his FPS went up to 60 and everything was fine for a few seconds. His GPU load (in gpu-z) usually was about 40%, only when the FPS got better it increased, too. So it looks like the GPU ist starving for input from the CPU wich is weird because we both hat high UPS. When we paused his FPS went up, afterwards they went down again. When he loaded the game in singleplayer mode he didn't have these problems. We both have pretty much the same hardware (same cpu (i7-2820QM), same gpu (Quadro 2000M), lots of ram). He has win 10 and I use 2012R2, though. Maybe this could be related to his bad Internet connection (he lives in an apartement which includes a shared connection over wifi with a limit of about 2Mbit/s), but since the UPS were high, we figured that this shouldn't be the case. Teamspeak was also running fine. One thing that was irritating us ist that we sometimes didn't have the same UPS, I always thought factorio was running completely synchronous.

Regards,
Michael

[Loewchen]

See performance issues here: viewtopic.php?f=7&t=3636 and add the requested information to your post.

[Mimos]

He did not get any catching-up-messages after loading so I dont't think this is the Issue (and we have exactly the same CPUs) and also the FPS were a lot lower than the UPS, but I'll look into it. Or ist there no catching up message if a client falls behind?

[Mimos]

Ok some tests show that lowering game speed a lot (to 0.6) helps to some degree. Loading the save in singleplayer we both geht 55-60 UPS, sometimes dropping to 50.

So I'll collect the requested data. What exactly is meant by show_time_used_percent? show-time-usage?

It would alo be nice If there was another way that would not disable achievements.

[Mimos]

Here is an archive with the savegame, screenshots and logs, I hope this helps. The screenshots were taken at 0.8 (=48 UPS) which is unplayable for my friend (=client) in multiplayer, going down to 0.6 helps to some degree but even then he still has occasional small hangs. In singleplayer we both get constant 50+ UPS and FPS, though.

https://www.dropbox.com/s/0rpc4av12vqc4 ... gs.7z?dl=0