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PB PM
Sneaky Punk
 
Join Date: Oct 2005
Location: Vancouver, BC
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2017-02-17, 00:47

Don't be fooled by read and write tests with a fusion drive. It's better than an HDD, or Seagate's traditional hybrid HDD, but it's not as good as those specs make it look. Where the fusion drive will struggle is working with is video, and large RAW files, which is why you are seeing slow downs. The slow downs come when the flash cache fills up and has to wait for the HDD to find stuff.

The flash cache is soldered onto the logicboard, no way to upgrade that. You could replace the hard drive with an SSD. I doubt Apple will do it since they don't ship 2.5" SSD's (Apple installs NVME SSD's in all modern Macs, again soldered to the board), so you'd need a third party Apple citified tech if you wanted to install a 2.5" SSD to get better IO performance.
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