GUI perfomance about optick

[bombomby]

Hi Martin, I've fixed this problem in 42754dc.
DirectX can't handle efficiently vertices with very large coordinates outside the screen - this was the main performance loss. To solve this problem I just split every thread into 20 smaller drawcalls and cull non-visible. The new version should work abot 20x times faster at large zoom.

If you need to zoom even deeper - feel free to tweak DIPSplitCount constant. The bigger this value - the faster Brofiler works at large zoom. I'd say that if you have 10 threads - you can safely increase this constant up to 200 without any problems.

But be carefull with the latest version - GUI is under major reconstruction at the moment and will be significantly improved soon.