Remove Unused JavaScript Code

How to optimize spe.cuhk.edu.hk

WordPress SiteScore: 60/100Analyzed January 2026

Remove Unused JavaScript Code

Medium Impact+12 points estimated

Why It Matters

80 KiB of unused JavaScript is delaying LCP by 350ms and wasting user bandwidth.

How to Fix

Disable unused WordPress plugins and remove Google Analytics if not needed. Use Asset CleanUp Pro to selectively load scripts only on pages that need them. Defer non-critical JavaScript using your LiteSpeed Cache plugin's optimization features.

0Needs Improvement

What This Score Means

A score of 60 falls in the "Needs Improvement" range (50-89). While it is better than poor (0-49), you should aim for 90+ to provide an optimal user experience and maximize SEO benefits.

This site is slower than approximately 35% of similar sites. The main issues affecting performance are image optimization, JavaScript execution time, and layout stability.

Addressing these issues could improve your conversion rate by 15-20% and boost your search engine rankings.

Core Web Vitals Analysis

LCP

Largest Contentful Paint

49.0s
Poor

Good: < 2.5s

Measures how long it takes for the main content to appear on screen

INP

Interaction to Next Paint

137ms
Good

Good: < 200ms

Measures how quickly the page responds to user interactions

CLS

Cumulative Layout Shift

0.00
Good

Good: < 0.1

Measures visual stability - how much content shifts during page load

AI Performance Analysis

This WordPress site has poor performance with a score of 60/100, indicating significant user experience issues. The biggest problem is an extremely slow Largest Contentful Paint of 49 seconds, primarily caused by inefficient image delivery that could save 541 KB and improve loading by 750ms. The site also suffers from render-blocking CSS files that delay initial page rendering by over 3 seconds, and has no caching configured for large image assets totaling 7 MB. Optimizing image sizes, implementing proper caching headers, and deferring non-critical CSS could dramatically improve the site's performance and user experience.

Other Optimization Recommendations

Optimize Large Banner Images

High Impact+25 points estimated

Why It Matters:

Your banner images are 541 KiB oversized and delay LCP by 750ms, representing the biggest performance bottleneck.

How to Fix:

Resize the banner image from 1920x1080 to 721x406 to match display dimensions. Convert the 379 KiB GIF to MP4 video format for 80% size reduction. Use WordPress plugins like ShortPixel or Smush to automatically compress and serve WebP formats.

Eliminate Render Blocking CSS

High Impact+18 points estimated

Why It Matters:

CSS files are blocking page rendering for 3,050ms, preventing users from seeing content quickly.

How to Fix:

Install WP Rocket or LiteSpeed Cache to inline critical CSS and defer non-essential styles. Use WordPress plugin Asset CleanUp to remove unused CSS from specific pages. Combine multiple CSS files into fewer requests through your caching plugin.

Want to Analyze YOUR Website?

Get AI-powered performance insights with actionable fixes in 30 seconds

More WordPress Speed Tests

WordPress Performance Resources

Frequently Asked Questions

Keep Your Site Fast After Optimization

Once your site is optimized, maintain that speed. Use DeployHQ for zero-downtime, automated deployments—so performance fixes and updates go live safely every time, without breaking your site.

Explore DeployHQ →Trusted by engineering teams shipping high-performance sites