Under high CPU or memory strain? If it's memory strain, it could be that disk i/o slows down, as the disk cache is flushed out to make way for application memory (by GIMP), and Banshee needs to read the audio file at a fixed rate to play it back.
Under high CPU or memory strain? If it's memory strain, it could be that disk i/o slows down, as the disk cache is flushed out to make way for application memory (by GIMP), and Banshee needs to read the audio file at a fixed rate to play it back.