Yes, by all means check Task Manager.
But, I have to laugh about all of the comments asking you to check cooling, because of something that happened to a hardware-challenged friend a dozen or so years ago.
This guy was a software guy with a particular expertise in Lotus Notes. But, his computer started to exhibit this behavior where it would run for a few minutes, slow down, and then start to make all sorts of errors. His other software friends had him play with the disk, make new “clean” partitions, etc., but nothing helped.
So, I was over there with my high-school kids, and we decided to take the cover off (it was a full-size tower). Yep... it was the cooling. So much lint had accumulated that the fan had burned out completely, and the video card (which was on a phenolic rather than fiberglass substrate) had huge brown burn marks.
We vacuumed it out, put in a new fan, and it was good to go. My friend was totally humiliated watching my kids yuck it up when they saw the problem.
So, by all means check your cooling. By itself, you wouldn’t expect cooling to make you use 90% of CPU when you load a page, but if you’re throttled down ... well that’s different because the CPU would be running at half speed.
Again, Task Manager first, physical inspection next.
TY. I’ve got a can of air. I’ll use it later, after my shift ends.
It’s not an AV problem, only one is running, Webroot.