Max Shutter speed
Fujifilm X-H1 can shoot continuously at max speed of
14.0 fps and has max shutter speed of
1/8000 sec. X-H1 also has an electronic shutter which can shoot silently at max speed of
1/32000s. One thing to keep in mind is that electronic shutter may cause rolling shutter / jello effects, and also banding issues under artificial light on your images.
Flash
Unfortunately X-H1 doesn't have a built-in flash but it has a flash shoe for mounting external flashes.
Focusing
Fujifilm X-H1 features both Contrast Detection and Phase Detection autofocus (AF) systems which ensures speed and accuracy of focusing in most situations. The AF system has 325 points to choose from.
Fujifilm X-H1 also features
Face detection AF where it intelligently detects the faces in the frame and locks the focus automatically.
Focus Stacking
Macro shooters will love Fujifilm X-H1's Focus Stacking feature. In this mode, X-H1 automatically composites multiple shots taken at different focal positions using focus bracketing to create a single image with maximum depth of field.