G3/G4 Cache Profiler includes a beta version of the G3/G4 Cache Profiler. Once downloaded, you should put it in your extensions folder and remove any previous versions that are installed.
Version 1.4b2 fixes a bug in 1.4b1 which caused a crash when booting Classic under OS X. It is otherwise identical to 1.4b1.
MacOS 8.0 - 9.