Yes it does have a USB 2 audio interface but that just connects the mixer's audio input it to the computer's internal sound card or most likely in this case an integrated sound chip on the motherboard.
I know it sounds confusing, but just think of a device like the M-Track not as a mixer, but more precisely as a "DEDICATED" external SOUNDCARD UPGRADE that plugs into the computer via USB2 instead of an internal PCIe slot. USB2 has more than sufficient speed to get 2 tracks of audio and 16 channels of MIDI smoothly in and out with M-Power ASIO drivers @ somewhere around 5ms latency.
I actually use a MUCH older and outdated M-Audio MobilePre USB2 interface that makes it possible to workably run about 8 audio tracks with an instance of Dimension Pro and Rapture each running in SONAR X2 Producer
smoothly with M-A's ASIO DRIVERS @ 5.6 ms latency on a Compaq Presario
consumer mid-grade Laptop with Win 7 64x and 8 gigs of RAM.
Try running X2 without the MobilePre on the same project on the same machine running MME drivers latency shoots up off the charts so bad that once I hit play it becomes completely unstable making it utterly unusable pile of lagging, choppy, echoing box of junk.
And BTW, with all due respect,
ASIO drivers most certainly DO prevent STDs! Now I'm not talking those free one size fits all ASIO drivers that allegedly are supposed to turn your little built in sound chip into a fire breathing dragon. I'm talking about replacing that little sound chip with a high quality soundcard with high quality tested and refined ASIO drivers written specifically for it. No matter what brand A/I you choose use that brands specific drivers.
While it's true their are many other causes like too many CPU intensive audio plugins running, trying to use and play ultra high quality samples without 8 to 16 gigs of usable memory, your virus protection kicking in, and etc. and so forth, and a whole list of other things that will of course bog you down quickly.
For over 10 years now I have been building and configuring my own, as well as for several select friends custom very high performance Windows based computer workstations. I haven't got any complaints yet.