A quick follow up. Two minutes is really not enough. Each zoom change or map type change can trigger a couple dozen tile requests. The browser will limit the number in flight at one time. The API cannot control the time at which a request is dispatched once it is submitted. A batch of twenty to thirty tiles could easily exceed two minutes. It is OK to prioritize tiles if a preempted tile can be fetched later. The API does not reload a discarded tile if it returns to view. Once it is considered missing, it is lost forever.
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