Good evenning,
In one or two months, I will buy a MacBook Pro with the new Leapard system, but, I want to know : if I install an OS X 10.4 software, will this software emulate by Leopard or not? And if yes, does it takes some memory or lower the performances?
Like when you use XP apps in vista it is not emulated. "Basic" apps should work. More "system" oriented ones (like ShapeShifter) will require an update.
Just try & see.
So : If it works : no performance loss.
Most apps should work just fine. Some apps that depend on internal system components (or change them) will require updates. However, most software should work just fine.
Okay, thanks. That's all that I want to know 
. So, I need to waiting for Leopard coming...
Almost all the popular apps I've tried (Adium, Path Finder, Mailplane, Opera, etc.) have worked fine on Leopard. I guess there really aren't a whole lot of major kernel changes between Tiger and Leopard.
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