Longstanding, devious, server performance vampire vanquished today

A very devious, tricky, and longstanding bug affecting server performance has been eliminated today. I feel like the coyote having finally caught the roadrunner on this particular issue. It has been my enemy for a long time and it is finally vanquished. I expect notable performance increases across the board, as this was a very low-level issue affecting raw filesystem and kernel performance, thus affecting every area of the system.