Does not noticeably slow down my computer

[bruceblore]

I have a Chromebook that I use for school and a personal laptop. The personal laptop is eight years old and I estimate that it has twice the CPU power as the Chromebook. The Chromebook has twice the single thread performance of my personal laptop, but is dual core without hyperthreading, but my personal laptop is quad core with hyperthreading. My Chromebook was made noticeably slower with one slowhotcomputer.com in the background, and unusable with 5 of them. However, my personal laptop is only noticeably slower when these tabs are in the foreground, no matter how many tabs of it are open. The CPU usage does increase, though. Normally, it is 5-30%, but having a few slowhotcomputer.com tabs raises it to 95-100%.

I am using Firefox on Linux. Do you think this is something that you can fix, or do you think it is a result of Firefox and Linux properly prioritizing resources to prevent this sort of thing?