I purchased 5 licenses for display pro. 3 of the 4 installed seem to work OK (the only thing we use it for is switching screens). The 4th one installed on my sec desk slowed the computer to a crawl. It crashed windows explorer. It was the only one we installed all the options on. The culprit seems to be all the wallpapers. I uninstalled Display Fusion and computer speed returned to normal. Machine processor is AMD A6 with 8GB DDR 3 1600 Ram. In retrospect, I probably should have only used the free version. It does the screen switching and selection.

reinstalled..left off wallpapers...seems to work better now. However, it now says my license isn't valid.