A follow up this thread which is now locked Very high CPU usage
I managed to sort my issue by changing the setting of the CPU Frequency Scaling Governor.
This is a good video explaining this setting https://youtu.be/Pc-uw1ena2k
Mine was set to OnDemand and when I switched to Performance, the cpu MHz increases dramatically and I have no problems running Vital anymore.
Also, if you use Cadence, there is a drop down menu to change this setting, enabled if you have the “indicator-cpufreq” package installed.
Edit: I just noticed indicator-cpufreq installed a menu in the system tray as well, which you can change the scaling profile with. So it may be useful regardless of using Cadence.