I just want to inform you guys that Chia client v1.20 has a huge improvement over the previous version. In my case, my CPU went down from 90-100% all the time to around 40-50% while farming 1,100 plots on Raspberry Pi 4 B 8GB. Other than the pooling protocol, I’m very happy with this performance improvement 
And as a bonus, now the installer is working on my Pi now.