High Sierra lag (iMac 21.5 late 2012 fusiondrive)

[ultradk]

Some times back I was running High Sierra on my main drive (fusiondrive) and I was wondering why the lag when login at start up the screen is jagging. Also when switching between fullscreen apps it was lagging.. Just unacceptable.. I couldn't understand - I thought perhaps fusiondrive was the enemy here.. However, I went back Sierra and everything is fine (except the system is old and not getting updates etc) but running as it should.

I have now tried High Sierra on my USB 3 drive, besides being slow as hell, it has the same problems.. It is surprisingly..

So is my iMac late 2012 simply not made for High Sierra? and why is the system lagging. Mind you both times was clean instal so everthing should be fine. I really want to go with High Sierra before buying new iMac.

 

[Taz Mangus]

If your drive is formatted as APFS that is probably why the system feels laggy. You can check the format of the drive by opening Disk Utility app, click on View->Show All Devices and select the top listed physical device. The format will be listed on the right side of the screen.

If your drive is formatted with APFS then you will want to erase the drive as Macintosh OS Extended (journaled) and install not to convert to using APFS. Instructions on how to not convert to using APFS in the posted link.

How to Skip Converting to APFS When Installing macOS High Sierra

MacOS High Sierra includes the all new APFS file system, which is arguably one of the most significant new features introduced in the new Mac operating system update. Nonetheless it’s possibl…

osxdaily.com

 

[ultradk]

If your drive is formatted as APFS that is probably why the system feels laggy. You can check the format of the drive by opening Disk Utility app, click on View->Show All Devices and select the top listed physical device. The format will be listed on the right side of the screen.

If your drive is formatted with APFS then you will want to erase the drive as Macintosh OS Extended (journaled) and install not to convert to using APFS. Instructions on how to not convert to using APFS in the posted link.

How to Skip Converting to APFS When Installing macOS High Sierra

MacOS High Sierra includes the all new APFS file system, which is arguably one of the most significant new features introduced in the new Mac operating system update. Nonetheless it’s possibl…

osxdaily.com

I did install Mojave on external usb 3 drive with APFS and it is slow as hell.. About High Sierra (albeit slow on the USB 3 disk) it's the same behavior as Mojave. No matter if I was using hfs+ on my fusion drive og hfs+ on my external usb 3 disk, it the same behavior - lagging when I log in and when switch between fullscreen mode (like swipe to another desktop).. I just don't understand why. When program is running - everything seems fine

 

[ultradk]

I was actually watching on youtube that I could "Cuda" from Nvidea and I was hoping I could upgrade the 650M driver - but no luck - even it says it need to be upgraded..