open with IE11 and Iceblue theme
CPU/GPU usage increase drastically making the page almost unresponsive
classic themes such as "breeze" don't have this problem
The border-radius styles of the <panel> component cause the performance hit on IE11
The negative effect gets worse in this case due to the gif loading animation
1) A <panel> without a border can just be replaced with a simple <div> component or no component at all.
2) Disable the border radius for <panel> without a border