Weird CPU usage graph (crossing lines)

[codeling]

Thanks for the great work, I love the extension!

Occasionally (especially at the beginning of a build) the CPU usage graph looks weird - with lines "going back", and criss-crossing each other. An example showing an example of this would be this:

It's just a minor display issue, but it's been bugging me a while, so I thought I'd report it. If I have some time I can hopefully look into fixing it myself.