Thanks for your test results, Michael
Update to icon.library 46.4.367:
Concerning my ineffective direct drawing optimization efforts I finally decided to modify the 363 code just a little by changing the order of some instructions.
In addition, there are a few new options supported now for displaying frames with planar icons only: PlanarFrames1 /2 /3 for different frame sizes and AllFramesOff which is a replacement for the old IconFramesOff (Delete that please).