2015 5K iMac unusably slow after Sequoia. Now trying Ventura and installation stuck on "16 minutes remaining"

iMac 17,1 - "Skylake" Quad Core 3.2 GHz i5 - 8Gb Ram

I first did a clean install of Sequoia - made a USB on another intel iMac. Had troubles with that installation too. When I eventually got it working the installation was ridiculously slow. Totally unusable. Like minutes for Safari to start. etc. I kept trying to use it over several days, thinking that maybe spotlight indexing etc might be making it slow for a while.

I installed the after-boot patches - even tried doing it a second time.

So now I am trying again, but with Ventura (thinking maybe Sequoia was too much?). Again - made a USB installer using OCLP. Wiped the internal Harddrive during install - now installing and it's been about five hours now - still stuck on "About 16 minutes remaining".

I also used disk utility on the installer USB to erase and run First Aid on the internal HDD, everything came back fine.

Any ideas what might be going wrong?

submitted by /u/Regular_Actuator408
[link] [comments]
Share: