[Windows update installing the new Edge browser] Update KB4559309 Makes Computer Unbearably Slow

The update took over 2 hours to complete, and when I start the machine, the startup time is over 5-6 minutes to boot.

FYI: For all those having issues with KB4559309, it would be more productive to follow what @NabilHaddad and @NathanRoberts are quoting in their useful posts, regarding how to report your issues in the Feedback Hub.

TIP: for non technical users, check the feedback hub, in the search bar put KB4559309 and scroll down the 45 or so reports there so far. if any match your problem scenario, then VOTE THOSE UP - that way the more users do that, the more visible it will be to the Microsoft admins who look at these.

For more technical users, who know about the Event Viewer, WER report checking, and any other diagnostic tools, debugs, or screen shots of Task Manager with any useful content, then PLEASE report these either through your MVP or developer channels, or into Feedback Hub as well.

NOTE TO Microsoft: only a few of the 45 entries against KB4559309 have comments, so I would urge your Admins to at least put in an interim comment on the more relevant ones, to reassure users that MS is looking at it and something will eventually emerge .

SUGGESTION: Microsoft should be investing in a Registry Scanner and sanity checker tool, similar (but better) than the ones available up to XP. There are many forums referring to "scanreg" and "scanregw" that DOES NOT EXIST for Windows 10 - please fix that misconception, by creating an official tool, as MS has articles that say Reg Scanners (like the CCLEANER one and the like) are banned - so create a proper one!

@ThirdJames - are you saying that clicking the start menu icon bottom left, Feedback Hub does NOT show in any programs starting with the letter "F", or is it that it starts then quickly exits? Either way, click on the square notifications box at the bottom RIGHT, then click on All Settings, then APPS. Wait a minute for all the APPS details to load, then scroll down to see if you can see Feedback Hub. if it is, then click on it, scroll down and choose the Advanced Options. Choose RESET and let it sort itself out.

Don't worry about the message about "The apps data will be deleted" - this is only referring to its temporary cache files, that often need cleaning up (as with many UWP apps). If it needs to re-install itself, it will do that automatically. Hopefully that might sort it out for you to start using it.