When Windows 10 became available I waited 3 months and finally decided to upgrade. Alas it's been a nightmare for me. The screen flickers constantly, programmes close without warning (or just will not open), Edge works sometimes, and often I get the "not responding" message. I have not added any extras (apps/programmes) to my computer (except Opera in an effort to find a browser that works consistently). I've been on Microsoft Chat Assistance (best they could do was offer me an upsell to buy a maintenance programme). I've written to Microsoft forums (apparently my problems are not uncommon). I've tweeked and twirked but still no fix.
I struggle daily with these problems - none of which happened before I upgraded. It's like they (Microsoft) have given me a free gift that has turned into an elephant in my office.