I have been running some tests on an older business desktop. This was a Mercedes 12 years ago. Even in the "same" OS of Windows 10, it's now bogged down with garbage on a fresh install. It's sluggish ...

100% - I use a laptop with a portable second monitor and for me 11 has been worth the upgrade over 10. Surprised others don't have similar usecases - didn't realise so few used multimonitor setups.