Sounds like your device has insufficient resources to efficiently handle multi-tasking. Maybe you have an older mechanical hard drive instead of a screaming fast SSD. Or possibly not enough on board memory.
As a rule when uploading gobs of videos to my server, I turn off non-essential processes like real time anti-virus scanning, screen savers and file backups. But even on my aging Win10 workstation, Creative Cloud apps rarely give me any problems.