I don't claim to know much about this issue, but apparently most soundcards have a flawed MIDI design. Jaroslav Kysela (of the ALSA project) reports that:
"...the problem is in the MPU-401 hardware specification. This hardware haven't the TX interrupt. Every soundcard with the standard MPU-401 emulation has this problem. "
Here is a short list of cards known to perform reasonably well in this area:
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