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BetterFPS Installed on Server

BetterFPS was installed on a server and it caused problems. BetterFPS is a client-side performance/optimization mod aimed at frame rate, it is not meant for a dedicated server.

What does this error mean?
BetterFPS tweaks client-side performance (math/rendering). On a server it provides no benefit and can attempt client-oriented behavior the dedicated server does not support, so it belongs on the client only. 
Client-side optimization mod
Most Common Causes
  • The BetterFPS jar placed in the server mods folder.
  • Assuming an FPS mod helps server TPS.
  • Copying client mods to the server.
  • A pack including it in the server set.
  • Mirroring the client mods folder.
How To Diagnose
  1. Check the server mods folder for BetterFPS.
  2. Recall it is a client-side FPS mod.
  3. Note any client-oriented errors at startup.
  4. Look for other client-only mods.
Recommended Fixes
  • Remove BetterFPS from the server
    Delete it from the server, players can use it on their clients if they wish.
  • Use server-side performance forks
    Run Paper/Purpur or Fabric+Lithium for actual server TPS gains.
  • Keep FPS mods client-side
    Frame-rate mods only matter on the client that renders the game.
  • Audit the mods folder
    Remove other client-only optimization mods from the server.
Analyze My Log
Frequently Asked Questions

No, it targets client frame rate. Server performance comes from Paper/Lithium-type optimizations.

On older client setups it can help FPS, on a server it does nothing useful.

Only on the client, never in the server mods folder.