The CPU spike and excessive SSD writes I experienced a couple of days ago when visiting the "What's New" page here on MT were caused by uBlock Origin Lite trying to block Reddit elements in posts. This issue doesn't occur when using Brave with its Shields enabled. So far, I've tried uBlock Origin Lite, AdGuard, and Ghostery on Microsoft Edge, as well as uBlock Origin on Firefox, and all of them have the same problem. I'll give tracking-blocking extensions a try to see if they can prevent it.