AudioFileOpenURL really bad performance when opening big *.m4a files

I did some testing for a project of mine and noticed that opening a big .m4a file with AudioFileOpenURL is really slow.
I tested opening about 25000 audio files.
All of them, except large mp4 podcasts like the engadget podcast, open really fast.
There seems to be a direct connection between the size of the file and the time it takes for AudioFileOpenURL to open it.
Files that are around 3MB have no noticable delay and files around 30MB will take seconds to open.
While opening AudioFileOpenURL consumes a lot of cpu.
I tried setting the correct fileTypeHint but that makes no difference at all.
Is there any explanation for this behaviour?
I can not continue with my project until i'm able to open all audio files in a reasonable time.
Maybe somebody has an idea how I can speed this up.

Certainly a reasonable concern...
The question at this point is, How are the reports going to be used and deployed once they are in production?
I'd look at it from that direction.
For example... They may be able to dump the data directly to another database on a separate server that would insulate the main enterprise server. This would allow the main server to run the necessary queries during off peak hours and would isolate any reporting activity to a "reporting database".
This would also keep the data secure and encrypted (it would continue to enjoy the security provided by an RDBMS). Text & csv files can be copied, emailed, altered & deleted by anyone who sees them. Placing them in encrypted .zip folders prevents them from being read by external applications.
<Hope you liked the sales pitch I wrote for you to give to the client... =^)
If all else fails and you're stuck using the csv files, at least see if they can get it all on one file. Joining the 2 files is killing you performance wise... More so than using 1 massive file.
Jason

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I know it is not a native excel file, that may cause the bad performance. So I ask my user to save it to a new file as a native excel format. The new file still worse than a normal excel file when we open it.
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I did a test today.
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Test 2: We save the file in native excel format, the file size is 2.28Mb, it takes 7 sec. to open.
Test 3: We copy all cell and "PasteSpecial" to a new excel file with value only. The file size is 1.66Mb, it takes only 1 sec to open.
Edited by: Rex Lin on 2010/3/31 下午 11:26

EBS or Standalone BIP?
If EBS see this thread for suggestions on performance tuning and hints and tips:
EBS BIP Performance Tuning - Definitive Guide?
Note also that I did end up rewriting my report as PL/SQL producing a csv file and have done with several large reports in BIP on EBS.
Cheers,
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John: I back up the catalogue (and optimize/check its integrity) every time I quit Lightroom - which is why excluding it from Time Machine isn't the end of the world. I did rename the catalogue early on in my troubleshooting process - as you say, I didn't like the fact I felt out of control of it.
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TJBUSMC1973 wrote:
You'll have to use iTunes, add it to your iTunes library, then sync it. You can always delete it from your iTunes library later.
Why is that such an issue for you?
Why do people insist on replying to threads without even reading the original post? I explained it there already!
I don't have to use iTunes to save an image from Mail into my camera roll, or to save a PDF from Mail into iBooks. Why should I have to use iTunes to save a music file into Music app?
But I'll repeat it since evidently you can't be asked to read the original posts before spamming a thread with questions that have already been answered. I *do not* want to add these songs to my iTunes library.
My iTunes library is a sacred temple into which I only allow to enter the very best and highest-fidelity musical recordings of all time. I refuse to sully and soil my iTunes library with crappy practice mixdowns from my band, etc.
Want to know why? Because I like to be able to hit "shuffle all" on my iTunes library and know that something that will improve my existence will emanate forth from this amazing device that I have invested thousands of dollars into (yes, I count my cell phone plan amongst the expenses).
I shall not have the crappy burner mixdown tracks from my band's practice sessions come up every five songs (we generate TONS of these... literally hundreds... and they are all high-bitrate .m4a tracks in the 10-15 MB range). I let iTunes keep my music folder organized on my computer. It makes copies of everything being placed into it, and I don't want 159 GB of copies of burner tracks hiding like roaches throughout my temple. We don't name these files anything sensible (in fact the guy who mixes them down intentionally gives them random weird names) and they lack metadata. So there's no easy way to delete them back out of iTunes once they're in there. It's a huge pain; I used to do it, but I swore it off years ago and *I'm never going back!*
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I bought Apple for ease of use, not so I would be forced to jump through a million hoops just do to something that ought to take one tap to accomplish! That's ridiculous!

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