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):
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):