Funny because I kind of have the reverse problem and never managed to troubleshoot / understand why (I'm not proficient in IT related things). I play on a "gaming" laptop with a SSD, but FFXIV has considerably slower loading times if it is on my SSD (while teleporting, I have 4-5 seconds loading normally, 13 seconds on my SSD). I haven't tried to run the Benchmark on my SSD though but perhaps comparing both would help indentifying the issue...
Does this problem ring a bell to anyone here?