LCP
Largest Contentful Paint
42.7s
Poor
Good: < 2.5s
Measures how long it takes for the main content to appear on screen
Eliminate Layout Shifts from Dynamic Content
How to optimize en.saif.sjtu.edu.cn
Eliminate Layout Shifts from Dynamic Content
Medium Impact+8 points estimated
Why It Matters
Layout shifts score of 0.108 creates poor user experience as content jumps during loading.
How to Fix
Reserve fixed dimensions for the swiper text-padding container that's causing major shifts. Add CSS min-height to research-wrap section based on content size. Preload swiper slider dimensions before JavaScript initialization to prevent pagination movement.
0Needs Improvement
What This Score Means
A score of 56 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
INP
Interaction to Next Paint
16ms
Good
Good: < 200ms
Measures how quickly the page responds to user interactions
CLS
Cumulative Layout Shift
0.11
Needs Improvement
Good: < 0.1
Measures visual stability - how much content shifts during page load
AI Performance Analysis
This website has poor performance with a score of 56/100, primarily due to extremely slow loading times - pages take over 42 seconds to fully load and become interactive. The biggest issue is a massive 5.6MB font file from an external CDN that blocks page rendering, combined with large unoptimized images and videos totaling nearly 25MB of data. The site also suffers from significant layout shifts as content loads, creating a jarring user experience. Immediate fixes should focus on optimizing or removing the heavy font file, compressing images to modern formats like WebP, and adding proper dimensions to images to prevent layout shifts.
Other Optimization Recommendations
Optimize Large Images and Formats
High Impact+25 points estimatedWhy It Matters:
Images are causing 25.6 second LCP delay and consuming 8MB of unnecessary bandwidth.
How to Fix:
Convert all slider images to WebP/AVIF format for 60-70% size reduction. Resize images to match display dimensions (417x199px for mobile sliders instead of 2560x1219px). Add explicit width and height attributes to prevent layout shifts. Implement responsive images using srcset for different screen sizes.
Fix Critical Render Blocking Resources
High Impact+20 points estimatedWhy It Matters:
CSS and font files are delaying first content paint by 3.6 seconds.
How to Fix:
Add preconnect link for cdn.campuswit.com to save 857ms on font loading. Inline critical CSS for above-the-fold content. Defer non-critical CSS like animate.css using media='print' onload technique. Load the 5.3MB HarmonyOS font asynchronously or use font-display: swap.
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Related Performance Analyses
More Generic Speed Tests
Generic Performance Resources
Enhance Security Without Performance Impact
Current Cloudflare challenge setup suggests security concerns that could be optimized to maintain protection while reducing overhead.
Implement Advanced Performance Monitoring
With a 99 performance score, proactive monitoring prevents future regressions and maintains excellent user experience.
Optimize Cloudflare Cache Configuration
Cloudflare challenge resources have zero cache lifetime, causing unnecessary re-downloads and impacting repeat visit performance.
Fix Critical Render Blocking Resources
CSS and font files are delaying first content paint by 3.6 seconds.