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Apple Computing Products:
macOS - Operating System
Performance a bit slow on my iMac (5K, Late 2015)
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<blockquote data-quote="bbnck" data-source="post: 1747963" data-attributes="member: 384434"><p>OK, final update.</p><p></p><p>After much investigation, it turns out the GPU is running out of vRAM when the animation stalls occur. Quite literally it is being caused by the amount of pixels the GPU needs to animate. With the Retina display, a full screen window is 14 million pixels alone - combine this with lots of other large windows and it can overwhelm the capacity of the GPU. I have found maximising windows has a significant effect on how frequently animation stalls occur - if I have lots of applications open but keep their windows unmaximised, animation stalls may not occur at all. </p><p></p><p>As I previously mentioned, I had submitted a complaint about this to Craig, and he had responded shortly afterwards asking me to forward over some sysdiagnose logs and a video recording of the problem so that they could investigate. After waiting several months, he told me they see some use cases that can benefit from further optimisation, but confirmed the problem is ultimately caused by the system running out of vRAM.</p><p></p><p>I don't know about you but I am certainly wondering why Apple decided to use a GPU that could easily be overwhelmed by the Retina display, but at least this issue comes to some kind of close and I am reassured knowing it is not an underlying hardware problem.</p><p></p><p>I should also mention I recently went to my local Apple Authorised Service Provider as the display was suffering from significant image retention, especially at high brightness levels. When I went to collect my machine, I tested an iMac they had on display as they also happen to be an Apple Authorised Reseller and I noticed the same animation stalls under the same conditions on the machine I tested.</p></blockquote><p></p>
[QUOTE="bbnck, post: 1747963, member: 384434"] OK, final update. After much investigation, it turns out the GPU is running out of vRAM when the animation stalls occur. Quite literally it is being caused by the amount of pixels the GPU needs to animate. With the Retina display, a full screen window is 14 million pixels alone - combine this with lots of other large windows and it can overwhelm the capacity of the GPU. I have found maximising windows has a significant effect on how frequently animation stalls occur - if I have lots of applications open but keep their windows unmaximised, animation stalls may not occur at all. As I previously mentioned, I had submitted a complaint about this to Craig, and he had responded shortly afterwards asking me to forward over some sysdiagnose logs and a video recording of the problem so that they could investigate. After waiting several months, he told me they see some use cases that can benefit from further optimisation, but confirmed the problem is ultimately caused by the system running out of vRAM. I don't know about you but I am certainly wondering why Apple decided to use a GPU that could easily be overwhelmed by the Retina display, but at least this issue comes to some kind of close and I am reassured knowing it is not an underlying hardware problem. I should also mention I recently went to my local Apple Authorised Service Provider as the display was suffering from significant image retention, especially at high brightness levels. When I went to collect my machine, I tested an iMac they had on display as they also happen to be an Apple Authorised Reseller and I noticed the same animation stalls under the same conditions on the machine I tested. [/QUOTE]
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Apple Computing Products:
macOS - Operating System
Performance a bit slow on my iMac (5K, Late 2015)
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