SSD speed issue

[walidur234]

My SSD speed drastically drops after 2-3 days of macOS installation. [check the attached screenshot]

Day 1, 2: speed is totally fine. ~3000/3000MB/s [R/W]
Day 3: speed drop to 3000/800MB/s [R/W]
[See attached screenshot]

SSD: Samsung Evo 970 plus 500GB, I know it has TRIM issue.


I'm very worried about these speed drops. I've also tried macOS Monterey, but no luck same problem. speed drops drastically after 2-3 days.

Edit: I'm using NVMeFix.kext

 

[Edhawk]

I think this is normal for Blackmagic Speed Test, and nothing to worry about.

• The first time you run the Speed Test (5GB) it shows the max R/W speeds for the drive.
• On the next and any subsequent tests:
  • It shows the Read speed as matching the first test.
  • But the Write speed drops incrementally, from the max down to the sustainable 'standard' speed.
• The 'standard' speed can be anything between 1000-500MB/s depending on the SSD/NVMe you are testing.
• This 'standard' speed is the real sustainable speed of the drive, not the max speed shown on the first run/test.
• The max speed will only be obtained over short/infrequent uses.
• You can't tell the difference in real life usage as to which speed the drive is working at.

This has always been the case when I have used the Blackmagic speed test app. I have been using it since 2014, according to my App Store purchase date.

 

[OG Nerd]

My SSD speed drastically drops after 2-3 days of macOS installation. [check the attached screenshot]

Day 1, 2: speed is totally fine. ~3000/3000MB/s [R/W]
Day 3: speed drop to 3000/800MB/s [R/W]
[See attached screenshot]

SSD: Samsung Evo 970 plus 500GB, I know it has TRIM issue.


I'm very worried about these speed drops. I've also tried macOS Monterey, but no luck same problem. speed drops drastically after 2-3 days.

Edit: I'm using NVMeFix.kext

I had similar issue with BlackMagic…. Have you tried AmorphousDiskMark?

 

[walidur234]

I had similar issue with BlackMagic…. Have you tried AmorphousDiskMark?

I didn't But here is the result.

 

[OG Nerd]

I didn't But here is the result.

Is this after multiple test runs?

 

[walidur234]

nope first run

Is this after multiple test runs?

Nope, first run. I'll run it for 2-4 minutes when I get time