Why am I getting so much lag with Minecraft shader packs?

My FPS whilst playing Minecraft usually ranges from 60 - 90 fps whilst using maximum render distance and maximum graphical settings, without optifine. For some reason, when using even the least appealing shader packs, I drop down to around 10 fps whilst on minimal settings. I've allocated 5GB of RAM, and it barely uses 10% of that.
My PC specs:
- Intel i7 (8 cores) 2.4GHz
- NVIDIA Geforce GT 650M graphics (2GB)
- 8GB of RAM
- Windows 7 64bit
- Currently running DirectX 11
- Using latest java update

Any help is appreciated!

Guest

I put this GPU in myself.
I guess I'll just have to buy a new one.

tyler

Your gpu is low end… But you have a laptop so your only choice is to buy a new one

DeMoNsLaYeR575

Shaders is also a really big mod and causes lots of lag normally. Try installing optifine maybe?

Lizzie