I have a 512 GB 840 SSD. I am getting write speeds of about 50-70MB/s and read speeds of about 450 MB/s in High Sierra. This is much slower than before. What can be done to fix this
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Slow boot
- Thread starter darkweather
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There are some reports about the TRIM Enabled status is wrong in HS.
You may open terminal, and enter
trimforce enable
It will ask for your password and reboot. When TRIM really work, it should fix your writing speed issue. (Assuming you have real SATA connection, but not USB connection to the SSD).
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Just a small update:
I installed public beta 2 of 10.13.1 today (build 17B35a) and this behaviour persists...enabled trim, 1m12s to boot. Disabled, 20s.
This is so sad. I'm really close to wiping the disk and reinstalling Sierra. My MacBook is a mid 2012 and it was very recently that I installed a custom SSD (1 month ago). I was so happy, brought it back full speed (I also had it not since 10.10 updated). Now, the regret of 10.13 is strong.
I installed public beta 2 of 10.13.1 today (build 17B35a) and this behaviour persists...enabled trim, 1m12s to boot. Disabled, 20s.
This is so sad. I'm really close to wiping the disk and reinstalling Sierra. My MacBook is a mid 2012 and it was very recently that I installed a custom SSD (1 month ago). I was so happy, brought it back full speed (I also had it not since 10.10 updated). Now, the regret of 10.13 is strong.
I didn't try it myself but looks like for most people who tried, like sasakihiro said, it tends to make no difference at all.
Not quite in my case... The blurry PDFs are maybe the biggest annoyance. There are other problems with some programs also, although minor enough to bear with. But for work reasons, having both the perfect PDF rendering and fast boot of Sierra would be more important than the rest I think. But I'm still trying to convince myself to stay on HS
Still slow here, nothing seems to work. Guess its waiting for a fix time.
Thanks for this feedback! Do you also drop the compiled SSD partition setup?
You can try this utility but be careful you understand what it is doing and use at your own risk. (scroll way down the page for the latest download links) Sometimes rebuilding the kexts and making sure the proper disk is still selected for your boot drive helps slow boots. I run the maintenance kext rebuild tab on this each time I upgrade the OS in any way and it seems to help.
https://www.firewolf.science/2016/0...ng-permissions-configuring-rootless-and-more/
https://www.firewolf.science/2016/0...ng-permissions-configuring-rootless-and-more/
You obviously havent been reading much of these threads.
It seems the largest number of slow boot issues are related to trim and whether its enabled or disabled. In my case, my boot drive is absolutely selected as the startup volume, its the first thing I checked.
But when I enable trim, on startups the progress bar stalls about 2/3 the way through for a good 20-25 seconds, then proceeds and takes around 52 seconds from off to desktop. (with the startup volume not properly selected the delay is before you even see the apple logo, so this is an entirely different phenomenon).
With trim disabled, it boots from off to desktop in about 25 seconds total.
As many have reported, this is consistently reproduceable. I've probably tested it about two dozens times over the past 3 weeks, and the result is always the same.
Btw, I also did clear my kexts files and it didnt do a damn thing.
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For general OS operation (mainly small random read), TRIM has virtually zero effect.
But for anyone that require sequential write performance (e.g. writing very large video file). TRIM can effectively keep the SSD deliver its max writing performance. (Which can be 4-5x faster than without TRIM).
Also, TRIM can effectively reduce SSD ware, extend life span. I can easily write >100GB a day. Keep TRIM enabled is much more preferable. The benefit is definitely larger than reduce few seconds on boot.
But of course, it depends on the users workflow. If someone, do lots of reboot, but very little writing (to the SSD). Then keep TRIM disable to avoid slow boot bug obviously is a better choice.
Yes I have....
Without trim, my read speeds on my ssd are 60mbps while my read speeds are 500mbps which is noticeable.
With trim, my boot times are insanely slow but my write speeds are 300mbps as they should be.
I received a mail from Apple:
Engineering has determined that your bug report is a duplicate of 34759667 and will be closed.
The open or closed status of the original report your bug was duplicated to appears in a gray text box within the bug detail section of the bug reporter user interface. For security and privacy reasons, we don't provide access to the original bug yours was duped to.
Engineering has determined that your bug report is a duplicate of 34759667 and will be closed.
The open or closed status of the original report your bug was duplicated to appears in a gray text box within the bug detail section of the bug reporter user interface. For security and privacy reasons, we don't provide access to the original bug yours was duped to.
I was actually referring to xgman with my comment. Not sure how I also copied your quote in there. You and I both agree trim and HS don't get along. Hopefully Apple is working on it.
[doublepost=1507881040][/doublepost]
I can't make head or tails of Apple's response. What does this mean? I was hoping it was them saying they're working on the issue, but that doesn't seem to be the case.
Guys I have a similar problem with different setup.
When I connect a external SSD (SanDisk, USB 3.1 Gen 1, UASP) with macOS high Sierra, it takes almost 40s to show the Apple logo. No matter if I am booting to the SSD or the internal Fusion Driver. When I unplug the SSD, everything is fine. Is it similar to what you are seeing?
After enabling verbose mode, I found the messages in the attached image right before entering the boot process. Those messages are not shown if the SSD is unplugged. Notice that after the boot, the speed of the SSD is quite good (200 MB/s / 450 MB/s, write / read). However, I cannot say how it will damage the SSD because of this behavior.
When I connect a external SSD (SanDisk, USB 3.1 Gen 1, UASP) with macOS high Sierra, it takes almost 40s to show the Apple logo. No matter if I am booting to the SSD or the internal Fusion Driver. When I unplug the SSD, everything is fine. Is it similar to what you are seeing?
After enabling verbose mode, I found the messages in the attached image right before entering the boot process. Those messages are not shown if the SSD is unplugged. Notice that after the boot, the speed of the SSD is quite good (200 MB/s / 450 MB/s, write / read). However, I cannot say how it will damage the SSD because of this behavior.
Attachments
Yes and No.
If you own a Mac shipped with Apple SSD from factory. You don't enable TRIM because TRIM is enabled by default and no way to switch it off.