I bought a new laptop recently (ideapad slim 5 ryzen 5700u). I want good battery backup from my laptop so I discovered about this software called auto-cpufreq. I am a long time fedora user so I tried installing it in fedora but it didn't work well with it (everything become choppy) and it did not affect the battery life that much.

Tried installing it in arch. It worked great. Battery lasts a whole day on a normal college day use. But the ram management is just horrible in this. After using it for a while, when I close all the open windows, it still for some reason shows that about 4gb of ram is used (out of 8). And if I try to open anything, it becomes unusable after the ram get full. This never happened in fedora. Its ram management was excellent. What should I do?