How we tracked down a Go 1.24 memory regression
When Go 1.24 was released in early 2025, we were eager to roll it out across our services. The headline feature—the new Swiss Tables map implementation—promised reduced CPU and memory overhead. Our story begins while the new version was being rolled out internally. Shortly after deploying it to one of our data-processing services, we noticed an unexpected memory usage increase: We observed the same pattern, a ~20% increase in memory usage, across multiple environments before pausing the rollou