This was updated because people believe it's performance lag, when it's actually network lag, here is an updated version of mine. So, to summarize, When I was on a survival server, the website that the owner was paying on for, optimized it to 1.17, but network latency overtook it and caused chaos.
The server was using spigot for some plugins like a anti cheat or 1 person sleep .
The server's owner stated, the network slowness issues were not there while the server was at version 1.16.5.
It used to be that 6 people could join it, however with the change from 1.16 to.17, only 2 people may join it without it crashing and restarting.
Mostly people are using normal Minecraft till Optifine comes in for 1.17 but I'm using the pre-release of 1.17.
Thank you for your report!
However, this issue is Invalid.
Your game, launcher or server is modified.
If you can reproduce the issue in a vanilla environment, please recreate the issue.
Any non-standard client/server/launcher build needs to be taken up with the appropriate team, not Mojang.
Any plugin issues need to be addressed to the creator of the plugin or resource pack.
If you have problems on large servers, such as The Hive and Hypixel, please contact them first as they run modified server software.
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