R0J0hound THX
For question 2 and "about the same" I get following results
60 seconds time = 60 dt time
= 63.8 wallclock = Real World Time
= 59.5 ticks/60
thats 5% difference between real world and everything else (except wallclock)
This was is kind of worst case szenario in Edge on my W10 i3-5010U Laptop
Just a note: doesn't matter if I add 30particle effects with 50objects each
Edit: now I made a test with 232 particles (100 objects each) where I get a 40fps framerate
60 time = 64 wallclock = 43 ticks/60