I've noticed that a lot of sites will end up using 100% CPU usage on their Chrome tab. I haven't investigated, but I do wonder what sort of faulty design leads to this. You occasionally hear talk of sites using your CPU to mine cryptocurrency, but I'm more inclined to suspect lousy programming.
I sometimes wish I had an easy way in Chrome to restrict a tab to, say, 5% CPU, for the cases where the CPU usage is clearly not adding any value. Just so I can get through an article without the fan ramping up.
It's my understanding that renice doesn't limit CPU usage, but rather adjusts the process's priority in the scheduler relative to other processes. So I don't think it would stop a process from eating up all available idle cycles, draining the battery, and ramping up the fan.
I sometimes wish I had an easy way in Chrome to restrict a tab to, say, 5% CPU, for the cases where the CPU usage is clearly not adding any value. Just so I can get through an article without the fan ramping up.