# Slow trace data retirival across API and UI in EU

- Provider: [Langfuse](https://down.guide/langfuse)
- Level: confirmed
- Impact: Degraded
- lasted 59m
- started 2026-10-21 07:46 UTC
- eu
- id: DWN-da998e0dd5
- Official page: https://status.langfuse.com/incidents/01M5EPTJX79TDVMB07KQV902HH

## Updates from Langfuse
### 2026-10-21 07:46 UTC: investigating
Slow traces data serving across API and UI

### 2026-10-21 08:31 UTC: identified
Slow clickhouse read replicas affecting performance across the service. Draining and replacing them.

### 2026-10-21 08:45 UTC: resolved
All replicas look healthy again

### 2026-10-21 08:56 UTC: monitoring
Looks like some timeout are still occurring. Monitoring.

### 2026-10-21 09:39 UTC: resolved
should be finally resolved

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