The CPU governor in Manjaro is usually set to powersave by tlp
The usual suggestion to change the governor is to use cpupower command
sudo cpupower frequency-set -g performance
but that will only change the governor temporarily and system will revert to using powersave when rebooted
To configure performance governor and enable cpupower.service:
What is changing my cpupower governor
CPU governor randomly switching to powersave thus heavily limiting performance