muis87 Posted November 22, 2017 Share Posted November 22, 2017 Hello, I tested my SSD write speed and read speed (see attachment). In Yosemite = 450 write and 450 read... Anyone a idea? Link to comment https://www.insanelymac.com/forum/topic/329921-slow-write-speed/ Share on other sites More sharing options...
muis87 Posted November 22, 2017 Author Share Posted November 22, 2017 In my Sierra installation its fine 450 Write / 510 read. Link to comment https://www.insanelymac.com/forum/topic/329921-slow-write-speed/#findComment-2538416 Share on other sites More sharing options...
Allan Posted November 22, 2017 Share Posted November 22, 2017 Have you take a look at the link speed? In About this Mac. Link to comment https://www.insanelymac.com/forum/topic/329921-slow-write-speed/#findComment-2538422 Share on other sites More sharing options...
muis87 Posted November 22, 2017 Author Share Posted November 22, 2017 ntel 6 Series Chipset: Vendor: Intel Product: 6 Series Chipset Link Speed: 6 Gigabit Negotiated Link Speed: 6 Gigabit Physical Interconnect: SATA Description: AHCI Version 1.30 Supported Link to comment https://www.insanelymac.com/forum/topic/329921-slow-write-speed/#findComment-2538425 Share on other sites More sharing options...
Allan Posted November 22, 2017 Share Posted November 22, 2017 Hmmm, maybe this can help you: http://www.insanelymac.com/forum/topic/327488-macos-high-sierra-final-release-is-out-17a365/page-9?do=findComment&comment=2504591 Made a copy of your current config.plist and apply this patch, save it with another name, eg: config.plist2 Then reboot, and in the Clover GUI select the config.plist2. 1 Link to comment https://www.insanelymac.com/forum/topic/329921-slow-write-speed/#findComment-2538437 Share on other sites More sharing options...
muis87 Posted November 23, 2017 Author Share Posted November 23, 2017 There are known issues of SSD performance under High Sierra if Trim is enabled and the volume is APFS. I understand the fix is to disable Trim. Ideally, stick to HFS+ for the time being. Trim is disabled and volume is HFS+ back to Sierra now.. Link to comment https://www.insanelymac.com/forum/topic/329921-slow-write-speed/#findComment-2538584 Share on other sites More sharing options...
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