It would be great if some performance enhancing mods can be installed for fabric servers, mainly jellysquid3's mods:
Phosphor:A Fabric mod designed to dramatically improve the performance of Minecraft's lighting engine while fixing many bugs
Lithium: A Fabric mod designed to improve the general performance of Minecraft without breaking things
Hydrogen:A Fabric Mod designed to reduce the game's memory requirements by implementing more memory-efficient data structures and logic.
It would also be great if the TabTPS plugin can be made compatible with fabric servers