I have just returned from a work trip, and I only just saw the last posts...
Due to a stupid bug, Vitruvius shows only one CPU, when in fact it uses ALL the CPUs. In the next beta version, I will correct this error.
As for the Blitz games, it's true: Vitruvius is weak.
It comes from DeepSaros, and then suffer due to a time management that is not optimal for this type of games... I have improved it, but only a little.
These versions are still experimental, released with the aim of finding errors and weaknesses of the engine. So I thank you for all reports and the tests!