Hmm. I get tiny spikes when moving around with ~6 Guitar Rig FX inserts on as many audio tracks (input monitoring on). Same basic idea, but fairly insignificant in size.
THAT is totally weird. I never thought a color profile could influence Logic's performance. A user on the official Logic forum hinted at that article. I tested it and indeed the performance got slightly better with the sRGB profile. Audio glitches are still there, but not as bad as with the default iMac color profile or the one I profiled with ColorMunki.
For those with the crackle problem - do you have it when feeding a sidechain into a comp? This was so weird I didn't even try to troubleshoot it. I tried using a sidechain to duck the bass with the kick. It worked when solo'd, and turned into a crackle party when playing the whole song. It did this with ANY plugin, Apple's or third party.
In the meantime I collected some more information about the issue. Cubase users seem to get plagued by quite similar issues lately so it might be presumed that Sierra introduced or aggravated some unwanted interaction between screen repaints and the audio subsystem which can result in CPU spikes and audio glitches. This would also explain why users with Retina display and internal GPU are affected more severely and/or often than others. So far two ways have been found to improve the performance and reduce (but not eliminate) the spikes and glitches:
1. Open Logic in low resolution mode (right-click on the Logic Pro X app in Finder => get information => open in low resulotion mode). Doesn't look that pretty but improves the performance significantly.
2. Change the Mac's color profile from the default one to sRGB
Everyone who is experiencing the same or a similar problem, please report this to Apple, too: http://www.apple.com/feedback/logic-pro.html
I have been contacted by an employee of Apple's audio team who requested some more information. So I hope they are already taking care of this. But I guess, the more people report that issue and send them further information, the better. Thanks for your help!
Also a user on the Gearslutz forum wrote a very interesting post about this from a programmer's perspective: https://www.gearslutz.com/board/12478142-post59.html
Have you tried setting multithreading to Playback Only, in audio preferences? I've found the new Live mode to cause the sort of issue you describe in some instances.
Thanks for your post. Any advice is greatly appreciated! However, I have already tried that, but unfortunately it didn't help to reduce the CPU spikes.
For the first time since switching to a mac, I'm considering moving back to a PC because of CPU spikes with a single MIDI track playing. BTW, I'm getting "scrolling bug" spikes in 10.2.4; haven't upgraded yet.
I was hoping that the just released MacOS 10.12.4 would perhaps improve the graphics performance and reduce the "scrolling glitches". Unfortunately I can't see any improvement so far.
@The KRock: please use Logic Pro X' feedback form on the Apple page to report the issue, too.
I don't know if the underlying issues were completely solved - the last thread in the CPU meter still gets a little nervous sometimes when clicking and scrolling in the main window - but the audio crackles and glitches have been noticeably reduced. Thanks to Logic's developers for taking care of this with the release of 10.3.2! I consider this solved.
The spikes and crackles while scrolling are gone, thats great!
But I still have crackles when I click with the mouse in the Arrangement and when I edit Tracks.
Anyone else has the same problem ?
Yes, the audio glitches while scrolling are gone. But clicking in the arrange area still generates last thread spikes on the CPU meter - although not as bad as before 10.3.2.
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Monkeymonkey35
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GrabtharsHammer
https://support.apple.com/en-us/HT207528
THAT is totally weird. I never thought a color profile could influence Logic's performance. A user on the official Logic forum hinted at that article. I tested it and indeed the performance got slightly better with the sRGB profile. Audio glitches are still there, but not as bad as with the default iMac color profile or the one I profiled with ColorMunki.
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stormy
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GrabtharsHammer
In the meantime I collected some more information about the issue. Cubase users seem to get plagued by quite similar issues lately so it might be presumed that Sierra introduced or aggravated some unwanted interaction between screen repaints and the audio subsystem which can result in CPU spikes and audio glitches. This would also explain why users with Retina display and internal GPU are affected more severely and/or often than others. So far two ways have been found to improve the performance and reduce (but not eliminate) the spikes and glitches:
1. Open Logic in low resolution mode (right-click on the Logic Pro X app in Finder => get information => open in low resulotion mode). Doesn't look that pretty but improves the performance significantly.
2. Change the Mac's color profile from the default one to sRGB
Everyone who is experiencing the same or a similar problem, please report this to Apple, too: http://www.apple.com/feedback/logic-pro.html
I have been contacted by an employee of Apple's audio team who requested some more information. So I hope they are already taking care of this. But I guess, the more people report that issue and send them further information, the better. Thanks for your help!
Also a user on the Gearslutz forum wrote a very interesting post about this from a programmer's perspective: https://www.gearslutz.com/board/12478142-post59.html
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nosebagger
Have you tried setting multithreading to Playback Only, in audio preferences? I've found the new Live mode to cause the sort of issue you describe in some instances.
Tom
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GrabtharsHammer
Hey Tom,
Thanks for your post. Any advice is greatly appreciated! However, I have already tried that, but unfortunately it didn't help to reduce the CPU spikes.
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RedBaron
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k.kalif
hi GrabtharsHammer,
I have a similar problem with my retina-imac, Logic 10.3.1 and Sierra.
As soon as I scroll thru the arrangement, I have tons of crackles and glitches and the timing of the Song is gone.
Strange: with some Songs, I don't have the problem til I put in for example a new exs-instance and than the problem is back.
When I put this exs-instance away, the problem is gone. really strange!
I'll report this to apple...
Best, Kai
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The KRock
Hi,
I'm getting the same issues while scrolling thru the piano roll with VI tracks as well as CPU spikes even when logic is doing nothing.
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GrabtharsHammer
I was hoping that the just released MacOS 10.12.4 would perhaps improve the graphics performance and reduce the "scrolling glitches". Unfortunately I can't see any improvement so far.
@The KRock: please use Logic Pro X' feedback form on the Apple page to report the issue, too.
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GrabtharsHammer
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k.kalif
The spikes and crackles while scrolling are gone, thats great!
But I still have crackles when I click with the mouse in the Arrangement and when I edit Tracks.
Anyone else has the same problem ?
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GrabtharsHammer
Yes, the audio glitches while scrolling are gone. But clicking in the arrange area still generates last thread spikes on the CPU meter - although not as bad as before 10.3.2.
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Glenn L.
You have been avenged!
I had this issue, too. Nice to see it gone.
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k.kalif
Hi GrabtharsHammer, any new about this topic ?
I still have problems with logic while clicking in the arrange window
best, kai
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