Non-linear timescale isn't actually a non-linear timescale
cpugraph-1.1.0
If width is 60 and refresh rate is 750ms: the whole graph is cleared if CPU load is zero for 60*0.75=45 seconds.
In the screenshot, the non-linear CPU load peak is moving with the same speed to the left as the linear peak, which means that the timescale is linear in both cases.