> For the complete documentation index, see [llms.txt](https://docs.tryterra.co/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.tryterra.co/faq/help-topics/data-api-sdk/webhooks-dedup-and-sync-reliability/coros-polling-latency-no-webhooks.md).

# Why are COROS activities delayed by several minutes?

**Yes, this latency is expected.** COROS does not offer webhooks to third-party integrators, so Terra polls their API per connected account.

* Activity webhooks can lag **a few minutes, occasionally longer**, behind the device sync, depending on where the account sits in its polling cycle.
* Polling is not batched; each account polls independently.

Telling users to expect a short delay on COROS activities is reasonable. If an activity **never** shows up at all (rather than just arriving late), report it for investigation.