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The French site MacTouch has posted a few speed comparisons between Mac OS X 10.3 Panther and OS X 10.4 Tiger on several different computers.

Tiger is generally faster than Panther on all Macs tested, but G5 users will see the largest speed boost. Excepting the G5's, memory and disk access was roughly the same under both versions of the OS.

The 800Mhz Titanium PowerBook showed significant speed increases in user interface and CPU tests under Tiger. Quartz Extreme rendering was much slower for some reason.

The Aluminum PowerBook 1.25Ghz showed similar improvements in speed with no significant change in Quartz speed, presumably because of its more robust video hardware.

The 1.8GHz G5 Tower showed memory and disk access speeds increase in Tiger. User interface speeds went up 51%. The promise of 64-bit hardware support doesn't seem to be paying off yet, as cpu tests were roughly on par between Panther and Tiger and Quartz was actually faster under 10.3.8.

See more results on the MacTouch site by clicking on the benchmarks graphic.