Hi grefra,
what version of Win 10 do you have, an upgrade may solve the problem(s) for you?.
PLEASE TAKE NOTE THAT AN UPGRADE IS NOT AN UPDATE PER SE; SEE THE LINK CREATED BY @Regedit32 BELOW FOR MORE DETAILS ON UPDATING AFTER CURRENT CUMULATIVE UPDATE. https://www.windows10forums.com/threads/windows-updates-after-kb4016871-reminder.13030/ See also: the following links about updating...
www.windows10forums.com
See the following which discusses "
Storage Sense" and "
Disk Clean" also!.
As a computer checker is PrivaZer reliable similar to CCleaner or similar software.
www.windows10forums.com
No idea about why your Edge browser takes so long to open, possible cause could be CPU speed, RAM speed or amount of RAM or an older type of hard drive (HDD) instead of a newer SSD?.