Ah, gotcha. Hmmm. I guess the question is what will the GPS Lat/Lon ultimately be used for? Because raw Lat/Lon is fairly useless. It would have to be converted to something more useful like ECEF or NED if you’re targeting real-time navigation applications.
The fastest GPS receivers output at 20Hz. And that’s already ludicrously fast for what you would need GPS for (i.e., if you need to sample GPS position at 20Hz, then what you actually truly need is an IMU).
Most real applications I can think of would already be happy with 5Hz GPS. And that really doesn’t require a lot of processing power, I think.
Just speaking purely for myself, if I were a customer, a native GPS parser would be rather boring. I would much rather have a native IMU parser, because then, that’s where speed really is critical.