4% slowdown observed in Mac OS X 10.5.6 compared to 10.5.4

[smcracraft]

Observed the above slowdown
when taking same version
of my chess program from
Mac OS X 10.5.4 to 10.5.6.

Apple is on the slippery slope.

It's getting so I don't trust
Operating Systems and their
companies any longer.

Does anyone do QA?

[bob]

Observed the above slowdown
when taking same version
of my chess program from
Mac OS X 10.5.4 to 10.5.6.

Apple is on the slippery slope.

It's getting so I don't trust
Operating Systems and their
companies any longer.

Does anyone do QA?

I don't see how it could do this unless it somehow manages to place your program in physical pages that map to the same section of cache, causing cache thrashing. Or unless it somehow doesn't recognize how much physical ram you have and makes the same mistake (above) for a different reason...

[sje]

I don't see how it could do this unless it somehow manages to place your program in physical pages that map to the same section of cache, causing cache thrashing. Or unless it somehow doesn't recognize how much physical ram you have and makes the same mistake (above) for a different reason...

More likely is that OS/X 10.5.6 is running some extra background tasks in a resource limited environment.

Hint: Turn off the Spotlight indexer if it's not needed.