TL Space Native: CPU spikes and audio glitches

[UK RAF]

Excuse me if this issue has already been dealt with, but I cannot find any mention to it anywhere, and wonder if it is something to do with my computer rather than the plug-in itself.

Whenever I instantiate TL Space RTAS in a Pro Tools Session, Pro Tools shows a CPU spike at 100%, and shows continuous usage at about 33%. Once there is audio passing through this one plug-in, there are frequent 100% spikes of CPU usage and drop-outs in the audio. This happens more often during the fade out after a transient.

This happens even in a session with a single midi track going to an XPAND! track which has the TL Space on it (about the simplest session I can think of with active monitoring of the problem).

I have recently upgraded to 7.3.1 thinking that this would fix the problem, but it is still there and driving me crazy.

I have no other performance issues with plug-ins or record/replay on my system.

Specs:
Music XPC-style computer (Shuttle SB61G2)
P4 2.8 GHz
1 Gig RAM
Digi 002
PT LE 7.3.1