This teflon sheet, you can get from some supermarkets, usually about £3.
Its, basically a teflon coated tightly woven fibreglass sheet and is black with flecks in it.
It is flexible so needs sticking down, I find that Scotch magi tape (The stuff thats supposed to be invisible on paper) works best.
The sheet is 40cm x 34cm in size, so plenty big enough for mouse use.
You just lay it out flat, stick the corners down first with a piece of tape, then stick the edges down with 4 long pieces of tape.
Don't worry, the magi tape can be removed without leaving a trace.
This results in an slippery surface which tracks 100% as fast as you can move that mouse, and I have been using this for years playing Unreal Tournament.
Believe it or not, you can improve things a bit by sticking some teflon feet to your mouse, but with the added advantage that they don't wear out!.