<p>See our <a href="https://www.bt.com/help/broadband/bt-cloud/getting-set-up/download-or-access-files/how-do-i-download-files--folders-and-devices-from-bt-cloud-">help page</a> for further information.</p>
Look at what extensions are turned on and disable what you don't need. Trial and error to eliminate problem....just a suggestion...not had this problem myself. I found Norton faster than McAfee, even on an old laptop.