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In answer to user questions here is a quick tutorial on how to switch Logic Pro between 32 and 64 bit modes with a short note on performance.
With the advance of 64 bit operating systems and now the release of Mountain Lion, many users are understandably concerned about the performance of Logic Pro, how it is affected and that Logic Pro still says 32 bit on the startup screen when both the operating system and Logic are supposedly optimised to run in 64bit.
So what exactly is 64-bit and why is it an improvement on 32-bit?
The theory is that full 64-bit systems and components should naturally handle twice the workload as 32-bit systems. This is because in a 64-bit system 64 pieces of information can be processed at any one time as opposed to 32 in a 32-bit system. The result of this can be greater speed performance and an increase in the complexity of tasks your system is able to perform. There are of course variables in this, such as whether all of the tasks on your system are performed in true 64-bit at all stages, but on paper this is how it should work.
Start up Logic Pro. You will now see it says 64-bit next to version
Now when you load an Audio Unit instrument or plug-in, you can see that there is the usual Audio Units category, but also one now for any plug-ins which will only run in 32-bit mode. All others are 64-bit compatible.