Hold on, your desktop PC has USB 3.0 ports, and it's possible your mobile PC does too. A USB 3.0 enclosure is not terribly expensive, and would provide a big performance boost with that SSD over USB 2.0.
This is a benchmark of an "old" Intel 80GB SATA II SSD in a USB 3.0 enclosure connected to a USB 3.0 port:
The sequential read and write speed specs for this SSD are 250MB/s and 80MB/s respectively.
As can be seen, the sequential, large file read and write speeds are not far off spec. ~200MB/s read speed from a USB (3.0) device is not bad at all.
Of course you lose NCQ support using the USB interface, but the small file (4K) read and write speeds are not terrible, and many times faster than any HDD on a SATA interface. Access times are also not terribly degraded, assuming they are correct (the single read and write access time readings are hopefully an average, and not a minimum figure.)
It looks like booting an OS from that SSD in the USB 3.0 enclosure would be faster than a HDD on a SATA port.
I never tried that SSD on a USB 2.0 port, but I imagine it would provide the maximum real world speed possible for USB 2.0.