Other than that I'm really scratching my head for ideas... The figures you posted (~500mbs sequential, 150mbs random) sounds roughly what you would expect from a SATA SSD... and you should be feeling that difference in Photoshop. 70% memory allocation with 16Gb is absolutely appropriate. I would probably locate the scratch disk on whatever volume has the better read/write rates and ideally has at least 16Gb of free space. Right now, my software is installed on the OS disc, and the files and scratch are on the data volume, which is the faster oft he two. What sort of workflow are you doing in photoshop; Raster graphics/artwork kind of stuff or photographs?What kind of file sizes/canvas sizes and how many layers are normal for you?What is your normal colour data setting - 8, 16 or 32-bits per channel? (along the top bar go into 'Image' > 'Mode')For example I'm mostly working with artwork, in the A1-A2 paper sizes at 200-300 DPI (which is around 4961 x 7016 pixels). I usually have about 10-20 layers active. I work in sRGB colour 8-bit per channel mode. My file sizes are usually between 200 and 400Mb. They take 2-3 seconds to load from SSD. I don't think this is a Photoshop issue, i'm getting it with other art packages or like clip studio, which is the main software that I'm using. Files that are under 500 megabytes on taking 10 to 15 seconds to load and longer to save. And computer game load screens should be going like lightning, but the only a little faster than when I was on a traditional magnetic disk.
There isn't anything in my motherboard manual about lane sharing but it's a modern gaming motherboard, so it shouldn't be a problem. There are 6 sata 3 ports, and I'm only using a single PCI E graphics card. For things that I'm doing the computer shouldn't even be breaking a sweat. It turns out that the issue was down to low space on my OS SSD. I cleared of about 90gig of stuff and the problem went away.
I'm still not sure why low space on my OS SSD would effect files being saved to my data SSD, but it apparently does.
Maybe there's some caching involved as I tend to install software on my OS SSD.
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