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spasmsouns

macrumors newbie
Original poster
Nov 5, 2017
6
1
Hi everyone! Sorry for my English, i know this language not so good.
So, let me speak about my problem:

I have iMac 27" middle 2011 (i5, 8GB RAM, AMD Radeon HD 6770M 512MB, SSD 250GB + HDD 500GB).

Everything was excellent, but recently something broke. I had an El Capitan installed, and everything was fine until UI started showing very very low fps. Firefox, safari, Finder, all system began to lag, to respond in a delay. In Activity Monitor everything was normal. RAM, CPU was not overloaded, computer does not overheat.

I tried to restart, i tried to reset SMC, PRAM, but this solved problem for a 5-10 minutes, then everything broke again. Then i tried a clean install macOS High Sierra, and a few days everything was fine, but today it happened again. I can resolve this problem by rebooting, and this is enough for several hours.

I don't know what to do, please, help me.

I'll attach a video showing the problem (it was recorded when el capitan was installed):
 
Do you mean even you leave the computer idle after cold boot, but the problem will still come after 5-10 min? Or it only comes when you use it for 5-10 min?
 
Hi everyone! Sorry for my English, i know this language not so good.
So, let me speak about my problem:

I have iMac 27" middle 2011 (i5, 8GB RAM, AMD Radeon HD 6770M 512MB, SSD 250GB + HDD 500GB).

Everything was excellent, but recently something broke. I had an El Capitan installed, and everything was fine until UI started showing very very low fps. Firefox, safari, Finder, all system began to lag, to respond in a delay. In Activity Monitor everything was normal. RAM, CPU was not overloaded, computer does not overheat.

I tried to restart, i tried to reset SMC, PRAM, but this solved problem for a 5-10 minutes, then everything broke again. Then i tried a clean install macOS High Sierra, and a few days everything was fine, but today it happened again. I can resolve this problem by rebooting, and this is enough for several hours.

I don't know what to do, please, help me.

I'll attach a video showing the problem (it was recorded when el capitan was installed):

The UI in El Capitan was always a bit rubbish with slow frame rates it was better than Yosemite though, you can either upgrade to Sierra or High Sierra for metal 2 support which seems to mitigate this issue to some extent.
 
Do you mean even you leave the computer idle after cold boot, but the problem will still come after 5-10 min? Or it only comes when you use it for 5-10 min?
The UI in El Capitan was always a bit rubbish with slow frame rates it was better than Yosemite though, you can either upgrade to Sierra or High Sierra for metal 2 support which seems to mitigate this issue to some extent.
I tried a clean install macOS High Sierra, and a few days everything was fine, but today it happened again. I can resolve this problem by rebooting, and this is enough for several hours.
 
I tried a clean install macOS High Sierra, and a few days everything was fine, but today it happened again. I can resolve this problem by rebooting, and this is enough for several hours.
My only experience with this kind of issue was when I had an app that was leaking some serious memory. The UI in macOS is relatively more memory hungry than others, and the bad frames you're getting could be the result of a memory leak. Are you using any third party applications, and is your software all up to date?
 
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