Hard to say. My laptop (PCIe SSD) boots in 3 seconds and takes 4 seconds to preview Copy Girl. My desktop (Samsung 850 Evo) boots in around 15 seconds and takes 5 seconds to preview Copy Girl...so the PCIe is much faster but only helps preview by about 1 second. That's not accounting for the rest of the machine though. My desktop's CPU is much faster so maybe that has something to do with it.
Also, that's a slightly older PCIe SSD. A brand new desktop PCI SSD could be faster but you're talking at least $400. Also I've heard they have some issues if used as a boot drive, but I don't remember the details. Last I looked into them was almost 2 years ago.
Some of my older projects take 15+ seconds to preview on either machine so I'm also wondering how I can improve that. I was just talking about it in another thread, but C3's in-editor spritesheeting might be the only thing to really make a difference here.