I've noticed version 12 opening much more slowly on OSX Mavericks than version 11 also.
I'm sure this is even more exaggerated on MacBook Air's, which don't have a lot of processor power compared to my iMac.
Strangely, the Windows version of 12 opens much, much faster than version 11!
For some specific numbers:
It took about 7 seconds to open a new project in 11, and about 30-40 seconds to open in 12.
Closing a project was about 2 seconds in 11 and 30-40 seconds in 12.
Seems surprisingly high!
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Well, as I said, your experience is going to be magnified on a MacBook Air.
On my iMac, opening is a bit slower than version 11, but closing is pretty much immediate. And the program's performance, once it is open, is every bit as fast as version 11.
Strange - I first noticed this performance problem last night after testing out the motion tracking - Premiere crashed and was slow ever since (only during startup / shutdown). Went back to play with motion tracking, produced a video successfully, now premiere is back to starting up and shutting down in 3-4 seconds.... The crash must have caused an issue.
I rebooted several times while having the issues, and it went away without me rebooting or doing anything.
If you're looking for more detailed advice, you may want to let us know your computer specs: Which OSX you're using, which processor you have, how much RAM you have, how large your hard drive is, etc.
As I said, Airs are built for portability, not performance.
I think I'm good now. I have no complaints about performance now that this issue is gone. 2013 MacBook Air, i5, 4GB RAM, 128 GB SSD. The only performance problems I have are playing 720p / 120 fps video back which I can live with given how little I shoot 120 fps.
Generally no lag or performance issues, but this is the fastest computer I've used with Elements so maybe I don't know what I'm missing:)
Yes, 120 fps would be a challenge even to my quad core 3.2 ghz system.
But if your Air is the dual-core i5 running at 1.3 ghz, that frame rate could definitely be a problem.
Happy moviemaking, brousseb!