That’s interesting, especially as that’s not what the link you’ve kindly referenced says. Congratulations on being able to change the user agent - Microsoft is not you and has to support decisions it makes. I can see why there’d be little cause for them to perform Linux testing given the small market share. So, if you were Microsoft - and not you - would you rather potentially break the experience for Linux users, or not enable what appears to be OS/browser specific code that speeds up the experience? Again, calling this a deliberate slowdown is extremely misleading.