Soooooooooo I wanted to try out rlcraft, (I hated it) and downloaded it through curseforge where it ran fine. Now after I downloaded valhelsia 3 it also worked fine. After which I played a little, than exited to change some stuff. So now it just didn’t work. I could open the launcher, but it took over 20 min to fully load, and when it ran it was laggy. I uninstalled the mod packs, launcher, and other mod packs, but nothing worked. I uninstalled everything, but Minecraft just runs incredibly slow now. Everything else on my PC runs fine, but whenever I click on Minecraft everything just kinda dies. Any help would be appreciated cause I just can’t really play Minecraft now.
I waited for a bit (like a month) and Minecraft got a little faster, and that was like half a year ago. Now I'm going to try again and see if it works normally. As a "fix" you can just get Badlion Client or Lunar Client and run Minecraft on those, I know for a fact that Badlion Client works 'cause I'm using it.