Originally posted by Ralph
[b]Thanks for the background
but;
This somehow implies that it will run at the reduced CPU rate automatically.
There is nothing automatic about Ctrl-S. It is a hidden, manual toggle which ships in the OFF position.
Originally posted by Ralph
I find an inconsistancy in the CPU used. From a low of 10~15% to a normal of ~40%.
It's inconsistant. DirectX is nothing if not INconsistant. But I am happy if it is under 35%.
Originally posted by Ralph
Perhaps the installation of V2 was influenced by copies of previous versions.
Different branches of the registry.
Originally posted by Ralph
However I installed V2 at work, (just to see what it looks like on a 19" LCD) a new installation and it runs at 100%...... And overheats the card to produce stuttering fish and bubbles in approximatly 10 minutes of running 
Set the Aquarium to 16-bit color, limit to 58fps.
If this does not clear up the problem, start killing off background tasks one by one.
Originally posted by Ralph
I will try the Ctrl-S routine on Monday to see if I can reduce the CPU demand..... or remove it
I would be shocked if Ctrl-S did not keep CPU usage to 100% unless you have inadvertently turned it on and pressing Ctrl-S is, in fact, disabling it.