I have a feeling I could get better performance out of Photoshop CS4 on my Mac. The most notable "problem" is that when I've worked with large Photoshop files and quit Photoshop it takes forever for it to actually quit. I'm thinking temporary workspace, but would that mean I'd need more memory or more hard drive space -or both? My Mac's a 1.67GHz Powerbook G4 with 1.5 GB RAM and an 80 GB hard drive (currently around 10 GB free space). Images are stored on an external Firewire 800 drive. I'm running MacOS 10.4.11. As far as I know I can only expand my Powerbook's RAM to 2GB, so would 512 KB more make much difference? The hard drive is a Seagate ST9808211A (80 GB ATA, 5400 RPM).