alan_m pretended :
Is there more than one real time virus checker running?

It looks as if there are two, but so slow its impossible to progress it
to a check..

If so they may be
fighting each other in that they are both constantly checking any files each
of the other checker may be creating. Win 10 comes with an inbuilt virus
checker but PC manufacturers are fond of bundeling another.
A second virus check could be put into manual mode and removed from the
startup list to see if it improves Win 10 performance.

If only I could get to the startup.