[0.16.51] Occasional UPS slow downs when running on different terrain(?)

[Skipo]

Hi
My somewhat large base started to slow down occasionally - only when outside (main) base and only when south-east of it/map center, so i opened debug menu to show frame cycle times and found that the only noticeable difference is "Flip[on]". Any way to expand that item? What does it do?

I was lucky last time it happened as i was able to take screenshot with halved UPS, move just a few tiles south and take another screenshot without any performance issues. When i returned back north it halved the UPS again. I did that multiple times and it finally stopped after about 3 minutes. It does that every time - all i need to do is stop running and wait it out (30 seconds to 5 minutes) or keep running but that takes longer and is sluggish

Thanks for any ideas

(PS: Did previewing my message really deleted all but one attachment?)
(Links to att. in case it really removed them:
Screen 1 - UPS low
Screen 2 - move away and UPS 60
Screen 3 - move back and UPS low again
Log
Save)

[Loewchen]

Try deactivating VSync, if this does not do it, reduce VRAM usage or sprite quality.

[Skipo]

I tried to turn of vsync and will report once i notice any slow down or in few days if it is gone

[Jap2.0]

The forum was updated recently and the problems with attachments is a known issue, but I haven't heard anything about them fixing it, so...

[Skipo]

I think it is better - I disabled vsync and after three days I saw little drop to 58fps and ups around the same location, but only twice. So i think its ok now Thanks