Slow Sync Due to Webhook Latency

If your Trigger Flow sync is consistently taking longer than 60 seconds, the issue is almost certainly related to the webhook delivery pipeline rather than SmartSyncApp's processing engine. This guide helps you diagnose and resolve latency issues.

Understanding the Latency Stack

The sync pipeline has three distinct segments, each with its own potential bottleneck:

• Smartsheet Webhook Dispatch (0–30s): This is the largest variable. Smartsheet batches webhook notifications, and during high-traffic periods (e.g., end-of-quarter reporting), dispatch can be delayed.
• SmartSyncApp Processing (1–3s): Our servers process the incoming webhook, evaluate conditions, and execute the API update. This is consistently fast.
• Smartsheet API Response (1–5s): The time it takes Smartsheet to acknowledge and commit the write operation to the destination sheet.

Diagnostic Steps

1. Check Smartsheet Status: Visit status.smartsheet.com to confirm there are no active incidents or degraded performance alerts.
2. Verify Webhook Health: In the SmartSyncApp dashboard, confirm your flow's webhook status shows as "Active". A "Disabled" or "Expired" webhook means Smartsheet is no longer sending notifications.
3. Check Event Log Timestamps: Compare the "Source Edit Time" with the "Webhook Received Time" in your flow's event log. If the gap exceeds 30 seconds, the delay is on Smartsheet's side.
4. Sheet Size: Destination sheets with 10,000+ rows may add 2-3 seconds to the reference lookup phase. Consider archiving old rows.

When to Re-Register the Webhook

In rare cases, a Smartsheet webhook can become "stale" — it appears active but stops delivering notifications. If all diagnostic steps above are clear but sync remains slow or silent, use the "Re-activate" button in your SmartSyncApp dashboard. This deregisters the old webhook and creates a fresh one.