I have no idea what actually caused this but it was solved by removing this mod. After an hour or two, entities start to jitter and stutter and warp around due to massive tps drops. Persists through save/reload and is only fixed by complete restart.

2021-07-29_04_56_36-my serv-1_17.zip
Sorry about hijacking this, but I'm getting some serious TPS issues in my server when the mod's loaded and I'm loaded in.

IIRC this was due to Angerable Patch spamming log files (which should be fixed now), but please let me know if you re-encounter the problem 👍

Try pressing F3+L (run /tick warp 3600 beforehand if Carpet mod is installed), then waiting for 10 seconds. A zip file should be created in your Minecraft instance's debug/profiling folder. Attach this latest zip file here.

Latest release (1.14.1) should probably solve this, otherwise follow the above steps ^^