I have had the windows 10 copy and paste problem, it seemed to arrive after an update. Copying and pasting runs extremely slow now, for edge and ie. It seems like some sort of buffer problem. Tried disk clean, emptying the cache, etc.
If I am on a web page, and choose select all, the page freezes up for 10 minutes before selecting all. Then I right click to bring up the option to choose copy (forget ctrl + C, just forget that as a possibility) and it freezes up for another 10 minutes, then choose copy, and again a freeze for 10 minutes, and then if I am lucky, I have copied, if I am unlucky (about 90% of the time) I have to go through the same routine again.
Its not the internet connection, tried with two different internet connections, and on another computer same internet connection same website it takes less than a second to copy the same page.
It all seemed to start after an update, I assume Microsoft decided the people don't need a clip board for surfing the internet or something.