VSIXInstaller is using too much CPU while waiting for apps to exit
VSIXInstaller.exe is using a continuous 8-20% CPU usage while it is waiting for applications to exit.
I suppose someone coded a ugly thread.sleep loop with a too short delay. I suggest extending the delay to a few seconds or adding a button "Check again" or "Refresh".
I plan to keep the VSIX window open for a few days because I cannot close the current instances of VS and I want this extension installed any time in the future. But I cannot allow the installer to use that much CPU!