crocens wrote:My problems Are finished. I restart whole computer. . Maybe during update memory was not relised or something ... no idea, reset helped.

My issue is no longer occurring, as well. Given that it showed up suddenly without reason, it seems appropriate for it to leave the same way.

I would turn the high resolution option off. I'm 95% sure that it is related to lack of video memory, so the graphics card tries to load and unload the atlases every frame.

Also the smoke is known to cause some severe FPS drops depending on your setup

Is the issue so bad when away from the ...

No mods used.

Log https://pastebin.com/saQZcrTZ

Having the graphics option for smoke enabled results in a large performance drop, down to ~8 FPS around my steam engines. Last night playing v15.6 this was not an issue, and I did not play during v15.7. The issue was first present for me during v15.8.