Plesk reporting CPU load as 2, SSH reports as 0.3

I have a dedicated server running a plesk control panel and a wordpress website.

The wordpress website is running woocommerce and is very CPU intensive as its constantly polling different suppliers for data and importing and updating the database...

The script thats doing this importing is running very slowly, and plesk is reporting the CPU load of the server as 2.0ish, but when I login to the terminal the CPU load is reported as 0.3.

Is it possible that plesk / wordpress is not using the full power of the server?

The server has Xeon(R) CPU E3-1225 V2 @ 3.20GHz x 4 and 32GB RAM. Really wordpress should be flying.

Thanks