Watching Go's new garbage collector move through the heap

Go 1.26's new Green Tea garbage collector improves memory efficiency through better cache locality and size-segregated allocation, but maintains a non-moving architecture that leaves fragmented heap pages unclaimed—a trade-off IT leaders should understand when evaluating Go for memory-intensive workloads. This technical advancement impacts infrastructure costs and application performance predictability, particularly for organizations running large-scale Go services where heap fragmentation could affect resource utilization. Teams should assess whether their Go applications benefit from Green Tea's optimizations or trigger the sparse-page problem, as this influences capacity planning and infrastructure refresh cycles.