# Salesforce: Performance Degradation: Core Service

- Impact (vendor’s label): minor
- Status: resolved
- Started: 2026-05-16 00:49 UTC · Resolved: 2026-05-19 00:49 UTC · Duration: 3 d
- Updates: 4 · Affected components: Core Service, 566 instances
- [Vendor status page: https://status.salesforce.com/incidents/20004026](https://status.salesforce.com/incidents/20004026)
- [Company: Salesforce](https://rewindex.com/company/salesforce.md)

## Timeline of updates

- **update** 2026-05-18 22:44 UTC: Investigations have highlighted that the impact radius is broader than initially understood. We have updated the posting to reflect the additional instances experiencing impact, and customers in these instances will receive communications related to this incident going forward.
- **update** 2026-05-18 22:44 UTC: At 00:49 UTC on May 16, 2026, we noted a performance degradation impacting the synchronization of email and calendar events. As a result, some customers may experience significant delays in email and calendar events syncing successfully.  Initial investigation has determined the issue is related to an unintended autoscaling operation affecting specific node pools. Engineering teams are actively working to stabilize the impacted infrastructure, prevent additional scale-down activity, and restore normal processing performance. We will provide another update within 30 minutes or sooner if additional information becomes available.
- **update** 2026-05-18 23:11 UTC: We have implemented corrective actions to stabilize the impacted infrastructure and have mitigated high-traffic data sources contributing to the delays. While we are seeing a steady improvement in processing rates, customers with the Einstein Activity Capture (EAC) feature enabled may continue to experience delays in email and calendar event synchronization as the remaining backlog of events is processed. We are closely monitoring the service as performance levels return to normal.  We will provide another update upon significant update or sooner if additional information becomes available.
- **update** 2026-05-19 01:23 UTC: After a period of monitoring, we can see that email and calendar event synchronization has returned to normal service levels. The incident has been declared resolved as of May 19, 2026 at 00:49 UTC. We apologize for any inconvenience this ‌issue may have caused your business.


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Canonical: https://rewindex.com/company/salesforce/incidents/20004026 · Markdown: https://rewindex.com/company/salesforce/incidents/20004026.md · JSON: https://rewindex.com/api/v1/companies/salesforce/incidents/20004026 · Generated 2026-10-18T10:29:30.486Z