I fixed this on my end 100% - after travelling through a translocator (or running a distance), I would get constant spikes of 0fps every few seconds. I used the instructions from the wiki about framerate and performance to diagnose, particularly the following:
Tip: You can troubleshoot the possible causes of lag spikes yourself by running the command .debug logticks 40 and then afterwards examining the `client-main.txt` log file in VintagestoryData/Logs.
For me - it was the Cave Symphony mod, and this was really easy to see in the logs. I disabled the "wind howl" system (as recommended by the mod author) and my problems went completely away.
Highly recommend that debug command - for me it fully explained the causes of my hitching.
