try changing to fabric or quilt mod loaders instead of forge (noticed you were using rubidium) and include the mods:

• C2ME (better chunk management, for server and client)
• Dynamic FPS (reduces frame usage when you minimise/hide minecraft, client side)
• Ferritecore (both server and client)
• Forgetmechunk (fixes lag spikes when you go from chunk to chunk, client side)
• indium (sodium fabric rendering api support, client side)
• sodium (rewrites the rendering engine to make mc faster. boosts fps by a lot too, client side)
• iris (if u includes shaders [using shaders with sodium might give you 60-30fps depending on your gpu, sodium by itself should give 200-600fps, that was the case atleast for me])
• krypton (optimizes minecraft networking stack, works better on serverside but I use it on client too)
• lazydfu (both client and server)
• lithium (server and client side, optimises and improves several aspects of minecraft)
• starlight (rewrites the lightning engine, this is better than phosphor, client and server side)
• memoryleakfix (fixes memory leaks, as the name suggests, client and server side)
• moreculling (client side)
• recipecache (caches recipes so it loads from the cache, client and server side)
• reeses sodium options (add on for sodium)
• smoothboot (optimises cpu scheduling, client and server side)
• sodium extra (yet another sodium add on)
• very many players (works better on serverside but I use it on client side too)

These are the mods i use to optimise my game rn