could be that your desktop has more ram so that the ssd cache softwre can make a larger cache drive. the other issues is the chipset on both and that with most laptops some of the ram is used for the video card. on your laptop you can update the mb chipset drivers see if anything changes.
Desktop: z87/i5/16 gigs & Laptop: HM65/8 gigs (both have lots of free ram)
Laptop has onboard intel vga and 6770m radeon card but is currently running on discrete one
You have anything running in the background? Anti-virus for instance?
Not really, MS security essentials on both devices.