I'm having a weird issue really suddenly, like it just happened today and was fine yesterday.
Normally when i play minecraft, I get an excessive amount of FPS. I play at 1080p, 60Hz. As of yesterday, with optifine, werrus v5.0 ultra shaders, and a 128x resource pack, i got about ~97fps. Now with no shaders, no resource pack, i get 58fps. And with the shaders enabled, its 18-27 at best. The resource pack makes minimal difference.
Try allocating more memory to Minecraft, try -Xmx4G in your JVM arguments.
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