The fitness figure is very useful. If you get a fitness of zero, it means there is a drastic problem with your settings.
For example trading periods of 17:00 to 24:00 when your data was 8:30 to 15:00
Or 3 months of data (not a good idea) and filter of > 500 trades.
The #C/us ration is the calculations required per system. If this is high, for example >100 GSB is finding it hard to make systems.
Likely you have wrong settings or a difficult market.
Also see Top/diag if you have a fitness of zero.
Speed by machine.
GSB admin only.
This gives you the total speed of all workers on a specific machine.