I find SSDs make a pretty big difference for Calibre. SSHDs work by caching data that's used repetitively so I don't think it will speed up a lot of the tasks dealing with a ton of small files that Calibre does.
Does your PC not have a spare SATA3 port and space so you can install an extra drive? Or heck, maybe use a USB3 SSD for Calibre. I find the biggest improvement that SSDs bring isn't the 500+ MB/s sequential speed but that their random small block read/write isn't a paltry 1-3MB/s as is the case for most HDDs.
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