Am running eMac with 375 Meg G4 (700 Mhz) with OS 10.4.8. Added LaCie DVD 4X DVD burner. Using iMovie and iDVD to burn a 20 minute movie takes over 2 hours to burn the DVD. The G4 processor is relatively slower (700 Mhz) than in newer machines. Could additional memory improve performance? I could upgrade to 750 Meg or 1Gig.