Ask anything about Performance.

Get instant answers with code examples.

Search Questions

Search Tags

Both Performance questions and answers are generated daily through our proprietary AI-assisted system. Purchase tags to help expand the Q&A Network.

Latest Questions

How do render-blocking scripts affect core-web-vitals performance?

Asked on Wednesday, Oct 01, 2025

Render-blocking scripts can significantly impact Core Web Vitals by delaying the loading and rendering of a webpage, which affects metrics like Largest Contentful Paint (LCP) and First Input Delay (FI…

What’s the correct Nginx config for setting cache-control headers and improving server-caching rules?

Asked on Tuesday, Sep 30, 2025

To optimize server caching and improve performance, configuring Nginx with appropriate cache-control headers is essential. This helps browsers cache resources effectively, reducing load times for retu…

How can I enable brotli-compression in apache for better core-web-vitals scores?

Asked on Monday, Sep 29, 2025

Enabling Brotli compression in Apache can significantly improve your website's loading speed, which positively impacts Core Web Vitals scores by reducing the size of transferred files. This compressio…

What’s the advantage of using async-js or defer-js in script loading?

Asked on Sunday, Sep 28, 2025

Using "async" or "defer" attributes in script loading can significantly enhance page performance by optimizing how JavaScript files are fetched and executed. These attributes help prevent render-block…

How can I reduce cls by reserving space for dynamic ads or images?

Asked on Saturday, Sep 27, 2025

To reduce Cumulative Layout Shift (CLS) caused by dynamic ads or images, it's essential to reserve space for these elements in advance. This can be achieved by defining specific dimensions for the ad …

How can I monitor real-user core-web-vitals with rum or analytics tools?

Asked on Friday, Sep 26, 2025

Monitoring real-user Core Web Vitals (CWV) can be effectively achieved using Real User Monitoring (RUM) or analytics tools that capture field data directly from users' browsers. These tools provide in…

What’s the best cdn strategy for global edge-caching performance?

Asked on Thursday, Sep 25, 2025

For optimal global edge-caching performance, a CDN strategy should focus on reducing latency by caching content close to users and efficiently managing cache expiration. This involves setting appropri…

Do excessive third-party-scripts increase cls and lower core-web-vitals?

Asked on Wednesday, Sep 24, 2025

Excessive third-party scripts can negatively impact Core Web Vitals, particularly by increasing Cumulative Layout Shift (CLS) due to delayed rendering and layout changes. These scripts can also affect…