[0.16.15] framerate drops to ~0.5 fps. Desync after login

[hooiberg]

After about an hour or more of normal play, framerate suddenly drops to about 0.5 fps or a bit less. So far, this has only happened during combat.
I have removed a few biter bases without a hitch, and then suddenly it goes wrong.
The framerate does not recover after the combat is finished.

After quiting when this has happened, and logging back in, I get more steps than regularly.
Usually it is 'downloading map' and possible 'catching up' and that is it.
messages such as 'server saving map', 'saving local variant' and a few more are shown.

When an other player is still logged in, time on the server progresses, and I can log in normally.
When I am the only player, though, I cannot log in again.

This on Ubuntu, on a railworld game. No mods are used.

Thank you for your concern and for offering this bug report mechanism

[Loewchen]

Describe the sequence please, how is the framerate drop related to the desync?

[hooiberg]

Sorry for being incomplete.

When I quit the game before the framerate drop, and I try to log back in to the same server, I can do so normally, without getting a desync report.
When I quit the game during the framerate drop, and I try to log back in to the same server, I get a the desync report.

[gacekssj4]

Just a hunch. Maybe it's not normal FPS drop, but rather a lag that feels bit like framerate drop?

[Rseding91]

Thanks for the report. The desync is fixed in 0.16.20. The 0.5 FPS is because you couldn't keep up with the server and so it dropped FPS to try to keep UPS up.

[hooiberg]

Wow. Thank you for the fix!
Time to update the server. And to get a better GPU.

[Zavian]

Wow. Thank you for the fix!
Time to update the server. And to get a better GPU.

When the client can't run the game at the same speed as the server the client is typically cpu bound, so a faster gpu probably won't help. Typcally the 'fix' is to slow the gamespeed down with something like

Code: Select all

/c game.speed = 0.8 

(That will disable achievements).