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  #1  
Old 04-29-2019, 07:43 AM
bradperry bradperry is offline
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Default Lag+CPU Spikes Related to Playhead Visibility

I’m experiencing an issue where my CPU usage skyrockets and the GUI/meters becoming very sluggish whenever the playhead is on screen, even if playhead is stopped. If I minimize the edit window, or even just allow the playhead to travel out of view, the GUI and meters immediately become very responsive and snappy. I did find the following thread where the poster described the exact same problem: http://duc.avid.com/showthread.php?t=396603

In the above post, the OP was told it was to do with them not running a compatible OS, but in my case, that is not so. I’m running 2018.12 on macOS 10.11.6, which appears to be “legal”. The system is a quad core Mac Pro with 1GB of GPU RAM, so there should be plenty of graphics card power to display that one blinking line . Interestingly, I also run 12.4 on a duo core MBP, which should be a much inferior computer, and yet, the problem does not appear on that system.

Anyone else experience this issue?
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Old 04-29-2019, 08:52 AM
BScout BScout is offline
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Default Re: Lag+CPU Spikes Related to Playhead Visibility

Which GPU?
Which exact Mac Pro model? (year, model number)

1GB GPU RAM just means calculation buffer for the GPU. Has nothing to do with how powerful it is. Your laptop GPU may be more powerful even
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  #3  
Old 04-30-2019, 11:20 AM
bradperry bradperry is offline
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Default Re: Lag+CPU Spikes Related to Playhead Visibility

Quote:
Originally Posted by BScout View Post
Which GPU?
Which exact Mac Pro model? (year, model number)
Mac Pro 1,1 (2006)
2 x 2.66 GHz Dual-Core Intel Xeon
16 GB RAM
ATI Radeon HD 5770
El Capitan 10.11.6

(The laptop is a 2009 MBP also running El Capitan 10.11.6)
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Old 04-30-2019, 01:47 PM
BScout BScout is offline
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Default Re: Lag+CPU Spikes Related to Playhead Visibility

Quote:
Originally Posted by bradperry View Post
Mac Pro 1,1 (2006)
2 x 2.66 GHz Dual-Core Intel Xeon
16 GB RAM
ATI Radeon HD 5770
El Capitan 10.11.6

(The laptop is a 2009 MBP also running El Capitan 10.11.6)
Yeah. That Mac Pro is completely not supported. Your MBP is much more powerful. The oldest Mac Pro that 2018 supports is 5,1 (or a 4,1 model upgraded to 5,1.) There are literal instructions sets that are part of the CPU that are needed that don't exist on a Mac Pro 1,1.

http://avid.force.com/pkb/articles/c...m-Requirements
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  #5  
Old 05-01-2019, 06:44 AM
bradperry bradperry is offline
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Default Re: Lag+CPU Spikes Related to Playhead Visibility

Thanks for the response and that link. Much appreciated. Does it make sense that it's a CPU limitation given how specific the symptom is? I should clarify, that I absolutely don't mean this in any sort of argumentative tone. Just trying to get to the bottom of this! According to that link, the MBP isn't supported either. Despite being a bit newer, the MBP is 2 x 2.56 GHz Core 2 Duo and I can't see how that could possibly be more powerful than the 4 x 2.66 Ghz Xeon, unless I'm really missing something about the older processor.

Just to reiterate, PT runs absolutely fine and fast whenever the cursor isn't visible. This is the reason I am hesitant to accept that it just boils down to the Mac being unsupported. The issue is only when the cursor is within view and it happens regardless of whether there is 1 track or 60 tracks, whether it's playing or stopped.

Are you able to further explain the following? This may shed some light on what I am not understanding.

Quote:
Originally Posted by BScout View Post
There are literal instructions sets that are part of the CPU that are needed that don't exist on a Mac Pro 1,1.
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Old 05-01-2019, 08:25 AM
BScout BScout is offline
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Default Re: Lag+CPU Spikes Related to Playhead Visibility

Quote:
Originally Posted by bradperry View Post
Are you able to further explain the following? This may shed some light on what I am not understanding.
There's more to a processor than just its core count and frequency speed of running. There are additional features and accelerated tasks that are handled by embedded instructions sets in the machine language/microcode of the processor itself. Developers can use these to complete critical tasks. (Often, if these instruction sets are missing, then the processor attempts to perform the task by brute force using regular cpu cycles which is detrimental.) The Mac Pro 1,1 used the Woodcrest processors (Intel Xeon 5150). It is missing 4 vector units and the whole SSE4.1 and 4.2 instruction sets which exists on the minimum processor (Intel Xeon W3565 - a Bloomfield processor with full SSE4.2 instruction set supported.)
https://en.wikipedia.org/wiki/SSE4

There is/was no 2.56 Core 2 Duo; There was a 2.53, 2.5, 2.6, and 2.55 though. I'm going to assume that's a typo to maybe 2.66 Core 2 Duo(?). In which case that was a Penryn processor that supports the SSE4.1 instruction set.
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Last edited by BScout; 05-01-2019 at 12:18 PM. Reason: typo
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  #7  
Old 05-01-2019, 09:06 AM
jwilkers jwilkers is offline
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Default Re: Lag+CPU Spikes Related to Playhead Visibility

If I remember correctly, and I may not because I've been asleep since then, El Capitan had all kinds of sluggish video issues.
Mine had like up to a full second of delay on meters.
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  #8  
Old 05-01-2019, 09:15 AM
bradperry bradperry is offline
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Default Re: Lag+CPU Spikes Related to Playhead Visibility

Quote:
Originally Posted by BScout View Post
There's more to a processor...
Ok, that all makes sense. Still surprising that it makes that much of a difference in this particular instance, but I certainly appreciate the clarification. Thank you very much.

Quote:
Originally Posted by BScout View Post
There is/was no 2.56 Core 2 Duo; There was a 2.53, 2.5, 2.6, and 2.55 though. I'm going to assume that's a typo to maybe 2.66 Core 2 Duo(?). In which case that was a Penryn processor that supports the SSE4.1 instruction set.
Yes. It was a typo. It's 2.53 GHz. My bad.
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