Pressing F1 to hide hotbar, scoreboard, chat, status bar and couple other things in my situation gives 400% fps boost. In the profiler I see that InGameHud.render() takes around 30% of cpu time. Rendering any kind of text is killing my pc. Rendering entities or nametags is also problematic. This issue is in Minecraft for a pretty long time. Tested on Fabric 1.18.2 with probably every public mod to enhance performance.