Monitor website performance with PageSpeed Insights and send alerts

Description

Monitor website performance with PageSpeed Insights and save to Google Sheets with alerts

This n8n template automatically monitors website performance using Google's PageSpeed Insights API, compiles detailed reports, and tracks performance trends over time in Google Sheets.

Use cases: Agency client monitoring, competitor analysis, performance regression detection, SEO reporting, site migration monitoring, A/B testing performance impact, and maintaining performance SLAs.

Who's it for
Digital agencies monitoring client websites
SEO professionals tracking site performance
DevOps teams maintaining performance SLAs
Business owners wanting automated site monitoring

How it works
Automated Testing:** Scheduled audits of multiple websites using PageSpeed Insights API
Core Web Vitals:** Tracks LCP, FID, CLS, and overall performance scores
Historical Tracking:** Maintains performance history for trend analysis
Alert System:** Sends notifications when performance drops below thresholds
Detailed Reporting:** Captures specific recommendations and optimization opportunities

Two Workflow Paths
Scheduled Audit: Automatically tests all URLs from Google Sheet on schedule
On-Demand Testing: Webhook endpoint for immediate single-URL testing

How to set up
Get a free PageSpeed Insights API key from Google Cloud Console
Create Google Sheet with columns: URL, Site Name, Category, Alert Threshold, Last_Processed_Date and Device.
Set up Google Sheets API credentials
Configure notification preferences (Slack, email, etc.)
Set audit schedule (daily, weekly, or custom)
Define performance thresholds for alerts

Requirements
Google PageSpeed Insights API key (free)
Google Sheets API access
n8n instance (cloud or self-hosted)
Optional: Slack/email for notifications

Google Sheet Structure
Input Sheet ("sites"):
URL, Site_Name, Category, Alert_Threshold, Last_Processed_Date and Device.

Results Sheet ("audit_results"):
Date, URL, Site_Name, Device, Performance_Score, LCP, FID, CLS, Recommendations, Full_Report_URL

API Usage (On-Demand)
POST to webhook:
{
"url": "https://example.com",
"site_name": "Example Site",
"alert_threshold": 75
}

How to customize
Add custom performance thresholds per site
Include additional metrics (accessibility, SEO, best practices)
Connect to other dashboards (Data Studio, Grafana)
Add competitor benchmarking
Integrate with project management tools for issue tracking
Set up different notification channels based on severity
Sample Google Sheet Included