... The resulting USB message can be double the size of the native MIDI message. Since USB is over 15,000 times faster than MIDI (480,000 kbit/s vs 31.25 kbit/s,) USB has the potential to be much faster. However, due to the nature of USB there is more latency and jitter introduced that is usually in the range of 2 to 10 ms, or about 2 to 10 MIDI commands. Some comparisons done in the early part of the 2000s showed USB to be slightly slower with higher latency ... -- The Truth About Latency: Part 2
... The resulting USB message can be double the size of the native MIDI message. Since USB is over 15,000 times faster than MIDI (480,000 kbit/s vs 31.25 kbit/s,) USB has the potential to be much faster. However, due to the nature of USB there is more latency and jitter introduced that is usually in the range of 2 to 10 ms, or about 2 to 10 MIDI commands. Some comparisons done in the early part of the 2000s showed USB to be slightly slower with higher latency ... -- The Truth About Latency: Part 2