I've recently installed Giga 3.0.4 on a P4 3ghz machine with a gig of ram. I'm running an RME 9652 card (which works fine with Kontakt & Giga 2.4)
I've tried a few different polyphony settings but the best I can accomplish feels like 1/4 sec latency using the stock piano. I've changed from the midi included in the RME card to an ESI-M4U USB interface but the latency is still there. I've lowered the buffer on the RME card from 256 to 128 with no luck.
If anyone has an idea I'd be sincerely grateful.