Excuse late reply, been gone a while....
A recent EN update to version 10.57.6 seems to have solved the issue,
cpu usage in background (not editing/using EN actively) hovers around 7-10% which is way better than 20-25% (full cpu core).
Not sure how memory usage was before, but now around 1 GB (1000 M) which is kinda enormous ... even twice as much as Microsoft Teams!
EDIT:
Cpu in background can drop to excellent 2% after some inactivity ... but memory usage is a bit "obscene" ...
