Just tested Adaptiverb from Zynaptiq with Gig Performer.
Adaptiverb is very cpu hungry and therefore a latency of 4000 samples is necessary.
But in the plugin a setup can be made to report zero latency to the plugin host.
With this setup Adaptiverb can be used as send effect.
BUt here is the issue, this setup seems not to be recognized by Gig Performer, so overall latency is driven by Adaptiverb.
When you play on the keyboard you get this huge latency and play live is not really possible.