Lightroom 5 Beta and Snow Leopard

Started May 9, 2013 | Discussions thread
Tom_N Forum Pro • Posts: 12,090
Re: I ran into the same issue, however

TeleView wrote:

Tom_N wrote:

TeleView wrote:

Afterall the later the OS, the more it uses native code, which should make it faster. For me, the steps to new OS's have always increased performance, not the other way around.

Mac OS X has always relied on native code for running native applications.  It was in classic Mac OS where Apple was running parts of the OS on the 68K emulator for a while.

Only since Lion has Rosetta not been available on OS X.

Your claim was "the later the OS, the more it uses native code, which should make it faster".

In many versions of classic Mac OS, there was code (e.g., in the Finder) that was 68K-only.  That code had to be run by the 68K emulator on PowerPC-based machines.  In other words, even if all of the applications you ran on your PowerPC-based Mac were PowerPC-native, you couldn't avoid using the 68K emulator.  There was no way around a speed penalty (if the speed was CPU-bound, more than it was disk-bound or human-reaction-time-bound).

Snow Leopard includes Rosetta, but it doesn't use Rosetta for running Snow Leopard itself, and it doesn't do much of anything with Rosetta unless you are running PowerPC applications.  So there is no "Rosetta speed penalty" for running Intel applications on Snow Leopard.  Removing Rosetta in Lion did not increase the percentage of native code used for running native applications.  And "native code" is not the reason for any speed boosts in Lion or Mountain Lion.

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