What is the execution order of the Delay action during simultaneous trigger queues?

When deploying IFTTT applets, logic that functions correctly during sequential manual testing may behave inconsistently under production loads. This is particularly evident when utilizing the 'Delay' action in conjunction with high-frequency triggers.

In a production environment, multiple applets may be triggered simultaneously, leading to a queue of asynchronous executions. There is uncertainty regarding whether IFTTT guarantees First-In-First-Out (FIFO) processing for these delayed actions or if execution drift occurs due to global rate limiting and platform-imposed throttling.

Does the 'Delay' action maintain strict chronological order when multiple instances of the same applet are queued? Which mechanisms, if any, prevent out-of-order execution when the platform encounters high-latency Webhook triggers?