Your queue handler hit the 10-minute Consumption ceiling last week. You restructured it to checkpoint, and the next month-end batch still creeps over. The question now is not how to wring one more workaround out of Functions. It is when the next workaround stops being cheaper than moving the job onto a different host. Four signals push the answer past "still cheaper": performance walls, complexity sprawl, coupling patterns the platform makes worse, and a cost crossover that arrives sooner than most teams plan for. Performance walls you will hit Four limits decide how far Functions can carry the workload: how long any one invocation can run, how much memory it can use, how many sockets it can hold open, and what its file system actually persists. Execution timeout per plan The numbers from the hosting plan timeout reference : Cross-cutting cap: HTTP triggers that do not respond within 230 seconds are cut off by the Azure Load Balancer with HTTP 502 regardless of functionTimeout .…