Since I updated to Windows 10, I occasionally have noticeable slowing down. When I bring up the Task Manager, I find at least one copy, and sometimes several copies, of “ActionUri OOP Server” running, and using system resources. If I kill them, the system noticeably improves, but it comes back again after a while (not right away, but eventually).
I found that Windows 10 speeds up considerably when I tell it I’m on a “metered connection” in the networking section. That is, I tell it that I have a data cap, so it gets much less profligate in wasting my available bandwidth for its own nefarious purposes. I’m lying to it, but it works.