One big problem it's the result of WebGL output.
You have an 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 have 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.