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which would probably not be practical for most people.Īn AMD Community thread further pointed out that the culprit is that the dGPU goes on full drive and draws ~20W of power whenever the laptop outputs to multiple monitors, seemingly because the driver lets the dGPU memory run on full clock speed "to avoid tearing". The ultimate solution seems to be to use an eGPU.
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If you're encountering this on Macbook Pro 16'' (2019), this seems to be a well-known problem regarding the laptop body not being able to handle the heat from both the CPU and GPU when external monitors are connected. This change has made such a dramatic difference in using Yosemite for me that I hope this is a solution for many others suffering from the slow down since upgrading to Yosemite. If anyone finds the same thing and, if so, removes this preference file then it would be good to either validate or invalidate this as a possible cause since the solution is so seemingly elusive so far. I'm still seeing long dumps of trackpad gestures in my system log which I had felt was the cause of the slowness but now appears to only slow things down at certain times (as well as cause Firefox's scrolling to fail) after using Firefox for a while the rest of the machine seems back to it's normal speed. I do think we're dealing with several different issues that are causing Yosemite to slow down and any of us may have one or more of these issues. (When I was looking at the file with an editor I experienced the same slowness in moving through the file.) Removing that file has eliminated nearly all the slowness that I was experiencing since switching to Yosemite and continues to do so. It appears that whenever an operation occurred that needed to access the (sequential) preference data from that file, reading the entire file brought everything to a near standstill until complete. Somehow my user preference file,, had acquired several keys with very long values (all named Bookmark) the lengths ranged from about 2.7 MB to 4.3 MB which made the size of the preference file larger than 11 MB. Yosemite: Accessibility zoom + multiple monitors = poor performance Today I found something that cleared up most of the slowness for me which I describe in detail in this link: I deleted my old answer since it had turned out to be only a temporary fix (if even a fix at all). I'm not yet aware of a real solution yet, let's hope that Apple will fix this in 10.10.1.Įdit: I've updated to 10.10.1 and the issue still persists, so I guess we will have to wait longer or go with the reinstall.Įdit 2: Switching to El Capitan has vastly improved this, so for me, this is no longer an issue. This was the best option for me, as I don't really worry about energy consumption, but honestly I don't think that there should be a real need for this. Switch off automatic graphic switching (System Preferences > Energy Saver).I've tried this, it might improve the performance but I was missing the look so I've switched it back. Reduce transparency effects (it's in System Preferences > Accessibility under Display).I had some minor success with this, but the issue started occuring later anyway Fix disk permissions, reset System Management Controller, reset PRAM (Luis Mercado explained this well at ).Dashboard as an overlay really slowed things down for me Mission Control: switch "Displays have separate Spaces off", switch Dashboard off.
From what I've collected yet, the following might be able to help you ( find my personal experiences in italic):
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