I gave up on MM2 last year because of how bad the transitions looked. Recently I had need of something like MM and decided to try again and had the same CPU load and terrible transitions until I found this thread.

With the latest Raspbian Stretch, MM2, and a downgrade of electron to 1.4.15 it works far better. Barely a spike on the CPU meter.

This thread is far too long. Considering the impact of this solution, it really should be in the FAQ on github. The only reason I even noticed this thread is due to the weekly Email summary.