When Stability Improves Performance (Threading)

The common assumption in concurrent systems is that stability and performance pull in opposite directions. You add safety mechanisms, locks, routing constraints, and you pay for them in throughput. This post is about a case where that assumption turned out to be wrong. The Premise TokenGate is a token-managed concurrency system. Decorated functions return tokens instead of executing immediately. Those tokens are admitted through a wrapped decorator, routed to per-core mailboxes by weight class,