@tasmanian-
Oh boy... It's been a LONG time since I used an Amiga PAR... (probably 10 years?) But as I understand it (granted, this is old knowledge, and may be flawed...)
NO. Amiga processor will have little (if any) impact on PAR performance. The DPS PAR board is pretty much self-contained. It really doesn't rely on the Amiga to help it out any, processor-wise.
Now, what it does count on the Amiga for is communication, though. If by 'importing' you are meaning using the PAR to grab a frame generated from an external source, the Amiga processor will make no difference. Now, if by 'importing' you mean loading a raw image datafile into the PAR filesystem, though, the Amiga processor MAY help this somewhat, but don't expect miracles. It shouldn't be taking the Amiga anywhere near 15 seconds to send image data to the card... So I would take that to mean that the PAR card must have to process that image frame before saving it into it's internal animation format. This is probably where the delay is. Though I don't remember this action taking nearly 15 seconds per frame. (To load 60 pre-rendered frames into an anim would take 15 minutes to import?? That doesn't sound right to me!)
Am I missing something here?