Stop specific processes from heating up my system's CPU

I have a process doing some computation the whole time. It causes my system's CPU to heat up and the fan to spin faster. I want this process to run, but with a low priority. I don't want my system to heat up and my fan to spin because of it. Is it possible to achieve this? If it matters, my CPU is an AMD Ryzen 5 3500U and the process is a browser tab (I'm running it in Chromium, but am happy to change browser if it helps). I'm willing to even run the whole browser inside a VM if it helps. --- What I tried and why it failed: 1. The best solution found so far is limiting the maximum CPU frequency:

echo 0 > /sys/devices/system/cpu/cpufreq/boost
    cpupower frequency-set -u 1200MHz

It works, but it means that other processes are affected too: compiling, (un)compressing etc takes way longer. Moreover, the CPU is still warmer than if the process wasn't running. Although to acceptable temperatures. 2. [cpulimit](https://github.com/opsengine/cpulimit) cripples the performance of the target process. If I set the percentage of CPU allowed to 50% (cpulimit -l 50 -p ...), the computation becomes a lot slower than normal (like 10x as slow; I don't have a good way to measure the accurate slowdown). 3. I played around with cgroups for a bit, but couldn't get any effect. 4. Nice has no effect of course. Is there anything else I should try?