Gmod unplayable on Ubuntu, but not Windows 7 (Same Machine)

[Squirrel Jesus]

I've had an Inspiron N5110 for maybe 4 years now or so, and for 80% of that time I had Windows 7 on it, it came preloaded. A few months ago I switched to Ubuntu 14.04. I removed Unity and lightdm and replaced them with i3 Window Manager. Playing Gmod was alright. On high graphics (which I wasn't able to do when I ran Win7) presumably due to OpenGL, but now I try to play it and it's to the point where I cant move. 1 frame will hang for maybe 10 seconds. Htop is telling me it's maxing out my cpu and ram. I don't understand why this is happening all of a sudden, when just recently it was working fine. Exiting Gmod, everything returns to normal.

My specs are:

4 gb ram
i3-2330M @ 2.2ghz
1gb Intel HD integrated

Appreciate the help.

[sunshinehunter]

Hey, have the same problem (I didn't try Steam on my Windows partition tho), I have about 10-20 FPS with lowest settings and weird textures. I tried updating with the "Intel Graphics Installer for Linux" which automatically downloads the drivers and installs it, but it didn't help in performance (I even get/got errors after the installation). Some help would be noice


My specs:
i3-350M
2 GB RAM
Integrated Graphics