Eternita
Comments
I think I found what exactly causes the problem - it's vertical redstone transmission tower.
Build tower out of glass or half slabs. Then start attaching redstone clock generators into it, attaching new one at the point where redstone signal of previous stops reaching. After building and enabling few of these fps will suddenly fall to single digit (I believe complete freeze in my world was because of a lot of stuff around). I've uploaded test.mp4 video that demonstates the issue and test.7z with copy of test world to try it.
Also the fact that destroying vertical transmission tower in copy of my world stopped issue from ocurring indicates that the problem lies somewhere in this area. Also this is completely client-side issue and does not affects TPS of internal server at all.
Once I got back to 1.16 prerelease 6, the problem was completely gone and I could not replicate it in that version. Something has changed since it, and it causes this problem.
So far I couldn't replicate it in the test world, and it's quite difficult to troubleshoot because this particular area has quite a lot of stuff - village, mob farm, large item moving setup. But I'm going to keep trying as well.
Hello. I added debug results as you asked. However please note that because client is almost completely unresponsive during lag, I could only start debug before lag occurs and only could stop it after it was gone, so the report contains some time where there was no lag at all.
Post your f3 screen