Optimizing minecraft 🔥outdoor_grill

What are your definitions of "fastest PC on earth" and "slow"? Could you post your PC's specs, how many FPS you are getting, and a picture of your F3 debug screen so that we can see your video settings?

Oh, and make sure(depending on whether you're running mods or not) that you haven't cranked MInecraft's dedicated memory. For normal Minecraft installations, 2-3 GB is perfect, but no more. For modded(depending on how many mods) 4 GB is good. If you're running a massive amount of mods, maybe 6 GB, but no more. When you give Java more room, it fills that room with trash, and the more room it has, the less of a priority it is to clean its room. So to make sure Java is a good little boi who cleans his room, be sure to give it a small room.

Please check your anti-aliasing in Optifine's settings, if you're running it. I too have a beastly PC, and when I turned that on, I struggled to get 45-50 FPS. Make sure the setting is turned off.

check the task manager and background programs. See which ones are consuming or draining your cpu and then close them. Also assign more ram to minecraft. After that you can install optifine and combine it with other specific fps optimizers like Phosphor.

What have you done?
Is literally everything set to the minmum in video settings?
Are you using optifine if below 1.14 or fabric + sodium for 1.14+?