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My MBP's SSD slowed down.

Ibanezq

Ibanezq

macrumors newbie
Original poster
Feb 28, 2017
12
4
Warsaw/Poland
I've a MacBook Pro 15" Mid 2015 with 1TB SSD and I noticed that write speed changed from ~ 1200MB/s to ~500MB/s after 1 year of using. Read speed is ~1800MB/s and still the same value after this time.

New disk: http://jmp.sh/xnoOMgK

Now: http://jmp.sh/cZmUuYZ

Drive has ~ 35TB of total bytes written, wear leveling count is 97% (data from DriveDx software):

http://jmp.sh/NJ5OqP7



How to check what's reason of this ssd slowdown?
 
Last edited:
Ibanezq said:
Maybe this is not the reason and is the other problem with system/drive?
Click to expand...

Are you on the latest version of High Sierra? I've seen some reports advising that in some instances write speed has been reduced on APFS, though I'm not personally experiencing this issue.
 
Ibanezq said:
Yes, 10.13.3 (17D47)
Click to expand...
Do a command-r boot to recovery then start Disk Utility and run first aid on the disk. Toward the end of the text readout there you should see a message something like "trimming unused blocks"... (I cannot recall exactly what it says). When that is done reboot and test again.

What that does is TRIM free space on the drive and often that will restore write speeds.
 
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Ibanezq said:
Solved - thank you. :)
Could you explain why first aid is nessesary although High Sierra supports TRIM?
Click to expand...
That first aid is using a TRIM command also, but run from recovery like that it seems to clean up the unused space and speed things up. I agree with what I think you are saying... that this should not be necessary... but it seems to be sometimes. Did you happen to do anything that results in a lot of heavy write activity lately?
 
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