Limit the total CPU usage for the entire system?

I'm running a Chrome instance on a NAT VPS. Being a NAT VPS it has some restrictions such not not allowing a 15min average load greater than 1. However, just starting and going to a few webpages causes the load to increase > 2 killing the instance. I read about limiting CPU usage online but most are limited to a single process, whereas Chrome spawns multiple process. I've tried using cpulimit but it doesn't help since it can only be used on a single PID. Is there a way I can limit the CPU usage of the entire system as a whole? Or atleast any process started by the chrome executable? Thanks. PS: The chrome instance is being started and controlled using Selenium on Python.