From 15e92d433f73c2cc041fd33603d273db01652a87 Mon Sep 17 00:00:00 2001 From: Vercel Date: Sun, 14 Jun 2026 05:03:01 +0000 Subject: [PATCH] Install and configure Vercel Speed Insights # Vercel Speed Insights Implementation Report ## Summary Successfully implemented Vercel Speed Insights for this FastAPI project using the vanilla JavaScript approach. ## What Was Done ### 1. Documentation Research - Fetched the latest official Vercel Speed Insights documentation from https://vercel.com/docs/speed-insights/quickstart - Determined that since this is a Python/FastAPI backend project (not a JavaScript framework), the vanilla JavaScript script injection method is the appropriate implementation approach - No npm package installation required for this Python-based project ### 2. Implementation Details **Modified Files:** - `main.py` - Added Speed Insights tracking scripts to the HTML response **Changes Made:** - Injected the Speed Insights initialization script into the `` section of the HTML response - Added the deferred Speed Insights tracking script that loads from `/_vercel/speed-insights/script.js` **Code Added:** ```html ``` ### 3. Technical Approach Since this is a FastAPI application that serves HTML directly from Python code (not a Node.js/JavaScript framework), the implementation follows Vercel's vanilla JavaScript approach: 1. **No Package Installation**: Unlike React, Next.js, or other JS frameworks, this project doesn't require installing the `@vercel/speed-insights` npm package 2. **Script Injection**: The Speed Insights tracking is enabled by injecting JavaScript directly into the HTML `` section 3. **Automatic Detection**: When deployed on Vercel, the platform automatically serves the Speed Insights script from `/_vercel/speed-insights/script.js` ### 4. How It Works 1. The `window.si` function initializes a queue for Speed Insights events 2. The deferred script loads asynchronously without blocking page rendering 3. Once deployed to Vercel, the platform will: - Enable the Speed Insights script endpoint automatically - Start collecting Web Vitals and performance metrics - Display the data in the Vercel dashboard under Speed Insights ### 5. Testing - Verified Python syntax is valid (no compilation errors) - Confirmed the script injection is properly placed in the HTML head section - The implementation follows Vercel's official documentation for vanilla JavaScript projects ## Next Steps To complete the Speed Insights setup: 1. **Deploy to Vercel**: Push these changes and deploy to Vercel 2. **Enable in Dashboard**: Navigate to your project in the Vercel dashboard and enable Speed Insights if not already enabled 3. **Verify**: After deployment, check the page source to confirm the Speed Insights script is loading 4. **Monitor**: View performance metrics in the Vercel dashboard under the Speed Insights section ## Notes - The Speed Insights script loads asynchronously with the `defer` attribute to avoid blocking page load - The script will only track metrics in production deployments on Vercel - No additional configuration is needed for basic functionality - The implementation preserves all existing HTML structure and styling Co-authored-by: Vercel --- main.py | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/main.py b/main.py index 43c9028..f51a787 100644 --- a/main.py +++ b/main.py @@ -44,6 +44,10 @@ def read_root(): Vercel + FastAPI + +