Can a uC drive a MOSFET at 500Hz
simulate this circuit &ndash; Schematic created using CircuitLab
This would be capable of driving 10m  @ 12V LED string
This is pretty common. Using 1k to 10kHz PWM &gt; 4.5V guarantees low side losses are minimal with 35.0 mΩ with high side of string to 12V.
If one was concerned about reactance use twisted wire to the string and between 12V and gnd to keep as short as possible. ~  5nH/cm into say 6W is 2A. L/R gives a fast rise time.
The string has SMD series resistors to dampen oscillations for each set of 3 LEDs but is designed to reduce current variations with V+ (10~14.2)
Gate capacitance is 1700 pF @ 0V thus even a 470~1k series R would not affect rise time results significantly. But if you were concerned about operator/ connector string induced ESD getting back into uC and the series R also dampens oscillations while increasing dissipation a slight amount.