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A1418 / EMC 3068 / iMac 18,1 / 2.3 GHz dual-core i5 processor. Released June 2017.

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Why is my iMac so slow all of a sudden?

My iMac has 16GB RAM and a 1 TB SSD, out of which about 500GB is still available.

Everything was working as normal until last night, when I was editing a video on Final Cut. All of a sudden, everything started being really slow. I restarted the iMac, but still had the same issue.

I turnt the iMac off completely, then turned it on to use it this morning and it's still veey slow. I tried to reset the VRAM but that didn't fix anything. Is there anything I can do, preferably without losing everything I have on it?

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From my experience of the mac has gotten really slow all of a sudden that tends to mean that ether the SSD or RAM is on its way out

Just to be in the safe side I would back up your data and try the following

Create a partition on your Mac to install macOS onto to see if that resolves the issue

I would also try running the hardware diagnostic

If you don’t get any issues I would consider replacing the SSD first then the RAM if the issue persists

SSD’s degrade over use just like HDD’s do,they will all need replaced eventually

Hopefully this helps

Any questions please ask


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Thank you for the in depth reply.

I only recently replaced the old HDD the iMac came with a brand new SSD. this was 2 months ago or so. Could it really deteriorate this quickly?

I will definately run the hardware test, thanks for the link. How would I change the RAM, if it will come to that?

EDIT: I just did the hardware test and it seems that somehow fixed the issue (for now, at least)




That great to hear that your issue has gone for now

Heres the link for ram replacement just in case;-)

Changement RAM iMac Intel 21,5" EMC 3068

Hopefully things stay good

If the issue reoccurs please don’t hesitate to let me know:-)




You must welcome!

Happy editing:-)


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It would probably be your I5 or you should check your task manager and see what's happening that's making it slow.

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Thing is, everything was fine until last night. Everything started being slow all at once.


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Darius Nitisor sera éternellement reconnaissant.
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