The Nullsoft MPEG Audio Decoder (in_mp3.dll) has a full file buffering feature. This feature allows an entire file, less than a specified size, to be read from it's storage drive to RAM before playback starts. After enabling this feature (a few years ago), I no longer experience any stuttering during playback of my mp3 files (< 20 minutes in length) no matter what else I'm using my computer for at the same time.
I sometimes experience a little stuttering with other file formats, depending on what else I'm doing with my computer. Going forward, can a full file buffering feature be implemented for all supported file formats?