You could use command line without a tool.
Set the governor to performance by running
echo performance | sudo tee /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
Check the status by running
cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
Disable performance mode by either running
echo powersave | sudo tee /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
when on an Intel CPU or by running
echo ondemand | sudo tee /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
if your CPU should be an AMD.