@koahnig: thanks for sharing.
The clean is definitely faster with jom, but apparently it looses later on time when starting for the different projects.
All checks are with compilation on ram disk with 8 cores
Interesting. As said, I'll do some more tests the next says and see how it behaves. For now jom is my winner.
jom was not happy my environment settings MAKEFLAGS=-j8
... but it does not need it on the other hand ;)