Well, the movement speeds Luban uses by default are conservative, and you may be able to push them up a bit—see various threads like https://forum.snapmaker.com/t/a-350t-print-speed-suggestions/25110 and https://forum.snapmaker.com/t/speed-limits-on-sm2/5120. This may lower print quality.
The “fast” print setting obviously is faster than the others, in part because it uses thicker layers, and therefore doesn’t have to lay down as many of them. Again, there’s a quality/speed tradeoff.
If you’re trying to print something that needs supports in its default position, and you can rotate it to a position where it doesn’t need supports, do so—that reduces the amount of plastic squirted out, so it both speeds things up and wastes less filament. There may be some tradeoffs involving mechanical strength and print direction, though.
You can also buy a nozzle with a larger aperture than the 0.4mm that the Snapmakers ship with, so that you can lay down more plastic faster. You’ll need to use a more advanced slicer like Cura if you take this route, because Luban can’t handle it. All Snapmaker models take MK8 nozzles. (As you may have guessed, there’s another speed/quality tradeoff here.)
Traditional small test prints you can use to help dial settings in include the XYZ calibration cube, the calicat, and the 3D Benchy.
Good luck.