Will a Micro Swiss extruder and hotend speed up prints on my Ender 3 Pro?
If you want a single word answer, then no.
Before you ask this question you need to figure out why your prints are slower than you want them to be. With default settings, unless your models are something dead simple like a big cube or cylinder, you're almost certainly limited by acceleration, not extrusion rate or even max print/travel speed (which you'll almost never achieve). Gcode analysis tools like gcodeanalyser.com will help you gauge this by predicting actual speeds the printer will achieve. Note that even if your model is simple, printing infill and top/bottom layers involves a lot of acceleration/deceleration cycles, so even for simple models this may still be your limiting factor.
Until you reach very high accelerations (over 5000 mm/s²) letting you actually achieve very high speeds (over 150 mm/s or so), the only way to make extrusion your limiting factor is by using really thick layers or wide walls. At 0.2 mm layer height and 0.4 mm line width, even a sustained 150 mm/s is only 12 mm³/s volumetric extrusion rate which is high but reportedly within the capabilities of the stock Ender 3 extruder and hotend (but probably requires cranking up the temperature).