One big problems it's the result of webgl output.
You have a old pc and also you want to make webgl stuff.
Also you have one big problem and this is about your video card and browser.
And this problem it's : ... don't want to show the result of your webgl.
The solution is : your tablet.
Many tablets has a good video card also you can use firefox web browser.
I try this demos and all working fine.
My tablet has a MALI GPU with 400 Mhz with 2D, 3D processor.
If you have ideas about how to use tablets to solve things , just send or comment here.