For the internal drive included with the laptop, we have a 512 GB Kingston device on the Pulse GL66. Its performance is good. While small, 512 GB is good to start off, and there is a second M.2 slot should you want to add another drive, which for me would be a must. 1900 MB a second for 512 GB is good, but it's definitely not the fastest out there.
USB 3.0 transfers are tested using an ORICO 6518 Series USB 3.0 docking station paired with a Crucial MX200 500 GB. For these tests, Crystal Disk Mark and HD Tune Pro are utilized to test and verify performance.
USB 3.0 performance meets expectations.