rMBP mid 2012 is useless under High Sierra

[stiwi]

I installed High Sierra lately on my rMBP 15" mid 2012, 2.7Ghz Quad Core i7, 16GB RAM DDR3L, 512GB SSD and since then everything work like a turtle. Something is slowing it down, definitely not the apps, I checked activity monitor. It's a powerful machine so it should work well. I have Mac Pro 2009 and High Sierra flies on it. But the mid 2012 rMBP became useless to the point I am considering buying a new one. I read something that it could be due to potential bug in High Sierra with the dual GPU on rMBP.

Anyone with similar issues?

Edit, similar issues reported below for the same but no resolution...:
https://discussions.apple.com/thread/8220029
https://discussions.apple.com/thread/8164739
https://forums.developer.apple.com/thread/78733
https://forums.macrumors.com/threads/mid-2012-mbp-high-sierra-ultra-slow.2074433/

 

[Naimfan]

Revert back to Sierra.

 

[TekAdvice]

I installed High Sierra lately on my rMBP 15" mid 2012, 2.7Ghz Quad Core i7, 16GB RAM DDR3L, 512GB SSD and since then everything work like a turtle. Something is slowing it down, definitely not the apps, I checked activity monitor. It's a powerful machine so it should work well. I have Mac Pro 2009 and High Sierra flies on it. But the mid 2012 rMBP became useless to the point I am considering buying a new one. I read something that it could be due to potential bug in High Sierra with the dual GPU on rMBP.

Anyone with similar issues?

Edit, similar issues reported below for the same but no resolution...:
https://discussions.apple.com/thread/8220029
https://discussions.apple.com/thread/8164739
https://forums.developer.apple.com/thread/78733
https://forums.macrumors.com/threads/mid-2012-mbp-high-sierra-ultra-slow.2074433/

That's interesting. What version of High Sierra did you download? 10.13.1 or 10.13.2? I updated my MacBook Pro recently to 10.13.2 from El Capitan and it has been running just as fast as ever, though I have noticed a decrease in battery life, which seems to be a common problem for older Macs that update to High Sierra. You may need to go into recovery mode and reinstall the os. https://support.apple.com/en-us/HT204904 You should not lose any files unless you have to repartition the drive. You will then have to reinstall Mac OS Mountain Lion since you have a mid 2012 Mac. Then you can upgrade to High Sierra from the App Store. Let me know if this helps. Cheers.

 

[stiwi]

That's interesting. What version of High Sierra did you download? 10.13.1 or 10.13.2? I updated my MacBook Pro recently to 10.13.2 from El Capitan and it has been running just as fast as ever, though I have noticed a decrease in battery life, which seems to be a common problem for older Macs that update to High Sierra. You may need to go into recovery mode and reinstall the os. https://support.apple.com/en-us/HT204904 You should not lose any files unless you have to repartition the drive. You will then have to reinstall Mac OS Mountain Lion since you have a mid 2012 Mac. Then you can upgrade to High Sierra from the App Store. Let me know if this helps. Cheers.

It's the latest 10.13.2. I tried to reset PRAM, SMC but without any success... I will try the recovery mode. Thanks.

 

[BaggieBoy]

I have virtually the same spec 2012 15" rMBP (2.6GHz CPU) but I'm having no such issues.

 

[upandown]

That's odd. It should be running it just fine. HS hasn't been perfect but it runs my first gen 13 rmbp well. I do think there are some weird bugs but if yours is so slow there might have been a bad install.

 

[Fishrrman]

Either do an OS re-install (I suggest creating a bootable USB flash drive and doing it that way), or... as Naimfan suggested above ... "go back" to Low Sierra.

 

[MyMacintosh]

I installed High Sierra lately on my rMBP 15" mid 2012, 2.7Ghz Quad Core i7, 16GB RAM DDR3L, 512GB SSD and since then everything work like a turtle. Something is slowing it down, definitely not the apps, I checked activity monitor. It's a powerful machine so it should work well. I have Mac Pro 2009 and High Sierra flies on it. But the mid 2012 rMBP became useless to the point I am considering buying a new one. I read something that it could be due to potential bug in High Sierra with the dual GPU on rMBP.

Anyone with similar issues?

Edit, similar issues reported below for the same but no resolution...:
https://discussions.apple.com/thread/8220029
https://discussions.apple.com/thread/8164739
https://forums.developer.apple.com/thread/78733
https://forums.macrumors.com/threads/mid-2012-mbp-high-sierra-ultra-slow.2074433/

I've been having this issue too although its hard to replicate at times. I'm at 8gb and 2.6Ghz. Certain sites definitely load slower. My battery health apparently needs servicing and I have thought about buying a newer MacBook pro but with all the recent battery news/throttling, I'm wondering if I just need a new battery....

 

[Raptura]

That’s odd because my 2012 rMBP with a lower spec (2.3, 8GB RAM) runs just fine. It’s not as fast for some tasks as my Touch Bar MBP but it’s stilk damn good.

 

[EugW]

Did you try a clean install?

Is the SSD near full?

 

[stiwi]

Did you try a clean install?

Is the SSD near full?

SSD is not even half full, however I did not do a clean install.

 

[Fishrrman]

OP wrote:
"SSD is not even half full, however I did not do a clean install."

I suggest you do a "full re-install".
BUT... do it from a bootable USB flash drive installer.

You will need to re-download a copy of the full HS installer.
You'll need a USB flashdrive 16gb (you can try 8gb and see if that works)
You'll need the free app "Boot Buddy":
https://sqwarq.com/boot-buddy/

Initialize the flashdrive to HFS+ with journaling enabled.
Use BB to create the installer.
Then reboot with option key (to invoke startup manager) and boot from the flash drive.

Try that and see if it works.

If you are still "running slow", once more my advice will be, "get back, get back, get back to where you once belonged" -- that is, revert to Low Sierra.