Drawing the graph has a high load impact, reduce the interval of redraw
if the user needs instantaneous values, then the list provides it,
the graph is there to provide historical data of behaviour not instantaneous values.
-------- | Load | Note
idle | 0.3 | screensaver
menu | 0.4 | No process update
extrude | 0.6 | updates temp
graph 5s | 0.8 |
graph 1s | 1.2 |
the load is the 15 min mean after about half an hour
Tests carried out on a Pi3A
0d259d6d04