Webgl performance test in most popular browsers:
1. Firefox 23 (run it twice, forgot about cache)
2. Google Chrome 29
3. Internet Explorer 11
For this test I used a real-time polygon triangulation algorithm(monotone partitioning via poly2tri). For each country I keep the result triangles in a buffer so triangulation will be executed only once.
FPS is low because of monitor capture program.
As you can see Google Chrome obatined good results, around 50 fps
Laptop: Dell XPS 15Z
CPU: Intel® Core™ i7 2620M
GPU: Nvidia Geforce 525M