MacBook Pro

[oldmanmax]

I have a MacBook Pro mid 2012 that has just become ultra slow, I mean I can type and wait for it to show. It has 16 GB of memory, and usually runs with 8-7 GB free, i7 processor and 2.9 GHz and a Intel HD Graphics 4000 1536 MB. All this started after installing Mojave, which has been taken off and Hight Sierra put back on. All systems have been checked at Apple store and have no issues per store ran system check software. Example of how slow is it took two and a half days to convert a MKV file to MP4 using handbrake. Apple support has me redo harddrive and reinstall hight Sierra a couple times. No help. Has anyone had this type of issue and if so was there a any success fixing the issue? It is driving me nuts, all help will be appreciated.

 

[Fishrrman]

Such are the hazards of wanting "the latest and greatest" OS.
Is there anything that compels you to use Mojave?
Have you considered "going back" to High Sierra for now?

Having said that...
You didn't tell us if the 2012 MBP is a retina or a non-retina?

IF it's the non-retina version with a removable SATA drive inside, it's easy and CHEAP to change out the platter-based internal hard drive for an SSD.

This will GREATLY improve the speeds and overall "usability".

ANYONE can do this, all you need is a Phillips #00 driver and a TORX T-6 driver.
Of course, you'll also need a SATA SSD (I suggest Crucial or Sandisk).
I would also get a USB3 2.5" external drive enclosure (also very cheap).
Go to ixifit.com to see an illustrated guide on how to do it.
Again, it's VERY easy -- a 15 minute job.

If the above is doable for you, there's plenty of help from users here in the forum to help you along with the drive prep and drive swap.

 

[oldmanmax]

Such are the hazards of wanting "the latest and greatest" OS.
Is there anything that compels you to use Mojave?
Have you considered "going back" to High Sierra for now?

Having said that...
You didn't tell us if the 2012 MBP is a retina or a non-retina?

IF it's the non-retina version with a removable SATA drive inside, it's easy and CHEAP to change out the platter-based internal hard drive for an SSD.

This will GREATLY improve the speeds and overall "usability".

ANYONE can do this, all you need is a Phillips #00 driver and a TORX T-6 driver.
Of course, you'll also need a SATA SSD (I suggest Crucial or Sandisk).
I would also get a USB3 2.5" external drive enclosure (also very cheap).
Go to ixifit.com to see an illustrated guide on how to do it.
Again, it's VERY easy -- a 15 minute job.

If the above is doable for you, there's plenty of help from users here in the forum to help you along with the drive prep and drive swap.

Actually did go back to High Sierra as stated in post, wiped drive before reinstalling High Sierra, no not a retina. Have given thought to SSD drive, and have all the tools to install as I replaced battery with one from ifixit. Thanks for the response. And thanks for the offer of assistance, forum has always be a wealth of knowledge and offers of help.

 

[keysofanxiety]

Actually did go back to High Sierra as stated in post, wiped drive before reinstalling High Sierra, no not a retina. Have given thought to SSD drive, and have all the tools to install as I replaced battery with one from ifixit. Thanks for the response. And thanks for the offer of assistance, forum has always be a wealth of knowledge and offers of help.

The SSD should vastly help, however be aware that your model has a very high failure rate with its SATA cable, which may be indirectly contributing to the problem.

I would definitely go for the SSD upgrade but also replace the SATA cable at the same time.

 

[patwithamac]

I have a MacBook Pro mid 2012 that has just become ultra slow, I mean I can type and wait for it to show. It has 16 GB of memory, and usually runs with 8-7 GB free, i7 processor and 2.9 GHz and a Intel HD Graphics 4000 1536 MB. All this started after installing Mojave, which has been taken off and Hight Sierra put back on. All systems have been checked at Apple store and have no issues per store ran system check software. Example of how slow is it took two and a half days to convert a MKV file to MP4 using handbrake. Apple support has me redo harddrive and reinstall hight Sierra a couple times. No help. Has anyone had this type of issue and if so was there a any success fixing the issue? It is driving me nuts, all help will be appreciated.

This sure sounds like the dreaded defective GPU problem that effected those of us with late-2011 thru early-2013 MBPs... for which the now-expired Apple repair program [*1] provided some relief.
Has your mid 2012 had it's GPU and/or system board replaced?

I had (and still have) a late-2011 that exhibited the same symptoms you've described. In the beginning anyway.
As the problem progressed, it would sometimes refuse to boot, and the display would show garbage/corrupted video.
I had the GPU replaced and all the problems went away. It still works perfectly to this day. Although it rarely gets used now that I've to a new 2018.

I'm not saying this is your problem for sure. But, it sure does sound like the symptoms I experienced as my GPU began to fail.

[*1] - https://www.apple.com/support/macbookpro-videoissues/

 

[chrfr]

This sure sounds like the dreaded defective GPU problem that effected those of us with late-2011 thru early-2013 MBPs... for which the now-expired Apple repair program [*1] provided some relief.
Has your mid 2012 had it's GPU and/or system board replaced?

I had (and still have) a late-2011 that exhibited the same symptoms you've described. In the beginning anyway.
As the problem progressed, it would sometimes refuse to boot, and the display would show garbage/corrupted video.
I had the GPU replaced and all the problems went away. It still works perfectly to this day. Although it rarely gets used now that I've to a new 2018.

I'm not saying this is your problem for sure. But, it sure does sound like the symptoms I experienced as my GPU began to fail.

[*1] - https://www.apple.com/support/macbookpro-videoissues/

The OP’s model would be a 13” based on his description of what’s in it, so this issue does not apply.
I do agree with the assessment that the disk cable may be faulty.

 

[Fishrrman]

Oops, I forgot about the "2012 MPB cable issue" when I replied above.
Does Apple still replace these free of charge?

 

[patwithamac]

The OP’s model would be a 13” based on his description of what’s in it

Sorry, guess I missed that it's a 13" somewhere.
In that case... in my best Gilda Radner Emil Litella impersonation... Never mind

 

[chrfr]

Sorry, guess I missed that it's a 13" somewhere.
In that case... in my best Emil Litella impersonation... Never mind

It’s not super easy to tell, but the 2.9GHz i7 was only in the 13”.

 

[oldmanmax]

I have a MacBook Pro mid 2012 that has just become ultra slow, I mean I can type and wait for it to show. It has 16 GB of memory, and usually runs with 8-7 GB free, i7 processor and 2.9 GHz and a Intel HD Graphics 4000 1536 MB. All this started after installing Mojave, which has been taken off and Hight Sierra put back on. All systems have been checked at Apple store and have no issues per store ran system check software. Example of how slow is it took two and a half days to convert a MKV file to MP4 using handbrake. Apple support has me redo harddrive and reinstall hight Sierra a couple times. No help. Has anyone had this type of issue and if so was there a any success fixing the issue? It is driving me nuts, all help will be appreciated.

Thanks to everyone replying on my issue, Apple is suppose to call me today to delve into this more. I will bring up the issue of CPU on the 13” machines and my bad on not mentioning it was a 13” when I posted. Again thanks.

 

[chrfr]

Thanks to everyone replying on my issue, Apple is suppose to call me today to delve into this more. I will bring up the issue of CPU on the 13” machines and my bad on not mentioning it was a 13” when I posted. Again thanks.

Aside from the disk cable there are no widespread hardware issues on the 13", CPU, GPU, or otherwise. The GPU problems only affect 15" models.