Jade

Jade is a JPEG viewer based on the Independent JPEG Group's library of JPEG compression and decompression routines. It's main purpose is to fill the gap in Macintosh JPEG viewers which can view full sized JPEG images while maintaining reasonable memory and speed requirements. It was also made to be useful as a helper application in Netscape or any other web browser application that supports helpers.

In addition to having more images open at once, Jade can also view JPEG images at their full size; all you really need is the disk space.

Jade is also fast at JPEG decompression. Jade offers various display modes which alow you to tradeoff image quality for speed. The only exception I've found is when color quantization is used (when the monitor can only display 256 colors or less). But when it's not used it really flies; especially on a Powermac.

Jade is in FAT binary, which means it will work optimally for both PPC and 68k machines.