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Substack: Substack experiencing increased latency

Affected components: Writer dashboardsEmail deliverySubstack publicationsSubstack.comCustom domains

Timeline of updates

1. investigating2025-09-15 15:24 UTC

   We are currently investigating reports of increased latency and slow response times across Substack.

2. investigating2025-09-15 15:34 UTC

   We are continuing to investigate increased latency and error rates across Substack.

3. identified2025-09-15 15:42 UTC

   We have identified an issue and are seeing normal performance across all systems.

4. identified2025-09-15 15:50 UTC

   We are continuing to investigate increased latency and error rates across Substack.

5. identified2025-09-15 16:38 UTC

   We are working to resolve the remaining performance issues across Substack and expect to see recovery shortly.

6. monitoring2025-09-15 16:46 UTC

   We are seeing recovery of performance across Substack and are monitoring the issue.

7. monitoring2025-09-15 16:53 UTC

   As part of the earlier incident, we are noting delays in analytics updating and post email delivery. We are working to resolve the issue.

8. identified2025-09-15 17:43 UTC

   We are seeing recurrence of increased error rates and degraded performance across Substack.

9. monitoring2025-09-15 18:39 UTC

   Substack is operating normally and our team is monitoring.

10. resolved2025-09-15 19:12 UTC

    This incident has been resolved.

Impact, status and times are the vendor’s own, as last archived. View on stspg.io (opens in new tab). Substack profile · Recent Substack incidents · Markdown · JSON