Do you have a midi file you're using to play them? On my i7-870 using the Spire demo, BA Octava on Cubase I'm only able to insert 25 instances before the output is no longer sent to the mixer (I'm guessing that's a Cubase thing or maybe demo limit), and of course so many of them sounds horrible but I guess subjectively I could say it's usable (peaking out on the Cubase CPU meter sometimes but no crackling or anything that would prevent use).
But that's just dinking around playing notes by hand so I thought a MIDI file might be a better point of reference if you have it to share.
Also with 25 instances generating the demo white noise swoosh it makes it hard to claim it sounds usable.
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