1.20.1 Forge server lag and FPS drops near base

[Colonizer_Void]

Hi! I just upgraded my self-hosted Minecraft Server Soft based Minecraft server from Spigot to Forge, because I needed mods that weren't plugins. After the transfer, I've experienced severely more lag on the server than before. The server console often reports the server running about 2000ms behind, and reports players "moving too fast"

Also on the client side, I have experienced a weird glitch where if I look a certain direction, the FPS tanks tremendously to about half of what it originally was. There isn't anything that should cause this, and sometimes it fixes itself for a few seconds before breaking again. This can also only happen at my own base, which doesn't have anything special that could cause the lag.

How can I fix these issues?

[Paint_Ninja]

Please share your Spark report. Instructions for troubleshooting lag and how to use Spark are in the FAQ 

[Colonizer_Void]

On 6/4/2024 at 1:54 PM, Paint_Ninja said:

Please share your Spark report. Instructions for troubleshooting lag and how to use Spark are in the FAQ 

My server is 1.20.1 
There is no such Spark version

On 6/4/2024 at 1:51 PM, Colonizer_Void said:

Hi! I just upgraded my self-hosted Minecraft Server Soft based Minecraft server from Spigot to Forge, because I needed mods that weren't plugins. After the transfer, I've experienced severely more lag on the server than before. The server console often reports the server running about 2000ms behind, and reports players "moving too fast"

Also on the client side, I have experienced a weird glitch where if I look a certain direction, the FPS tanks tremendously to about half of what it originally was. There isn't anything that should cause this, and sometimes it fixes itself for a few seconds before breaking again. This can also only happen at my own base, which doesn't have anything special that could cause the lag.

How can I fix these issues?

BTW My Forge version is 47.0.35 on the server and all clients, and has always been downloaded from the same private Discord server to avoid error.

[Paint_Ninja]

Spark definitely has downloads available for Forge 1.20.1 on the CurseForge website.

47.0.35 is a very old beta version of Forge. You should be running 47.3.0