LCP
Largest Contentful Paint
3.2s
Needs Improvement
Good: < 2.5s
Measures how long it takes for the main content to appear on screen
Eliminate Render-Blocking Resources
How to optimize en.saif.sjtu.edu.cn
Eliminate Render-Blocking Resources
High Impact+12 points estimated
Why It Matters
Render-blocking CSS and JavaScript delay LCP by 3.8 seconds, severely impacting page load performance.
How to Fix
Inline critical CSS directly in the HTML head section instead of loading external stylesheets. Defer non-critical CSS using media='print' onload technique. Move JavaScript files to load asynchronously using async or defer attributes, especially for swiper.js and tracking scripts.
0Needs Improvement
What This Score Means
A score of 79 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
0.01
Good
Good: < 0.1
Measures visual stability - how much content shifts during page load
AI Performance Analysis
This website has below-average performance with a score of 79/100, but faces serious loading speed issues. The biggest problem is render-blocking resources that are delaying page display by nearly 4 seconds, particularly a large 5.5MB font file that's crushing the loading experience and contributing to a very poor Speed Index of 9.9 seconds. The site is also bloated with 6MB of total resources, including 120KB of unused JavaScript and oversized images that could be compressed by 300KB. Fixing the render-blocking font loading and optimizing images would likely improve the performance score by 15+ points and dramatically speed up the user experience.
Other Optimization Recommendations
Optimize Image Delivery Strategy
High Impact+8 points estimatedWhy It Matters:
Large, unoptimized images waste 303 KiB and lack proper dimensions causing layout shifts.
How to Fix:
Compress the hero banner image (currently 257 KiB) and convert to WebP format for 60% size reduction. Add explicit width and height attributes to all images to prevent CLS. Serve properly sized images - resize the 1920x190 banner to match its 412x41 display size on mobile.
Remove Unused JavaScript Code
Medium Impact+6 points estimatedWhy It Matters:
120 KiB of unused JavaScript increases bundle size and parsing time without providing functionality.
How to Fix:
Remove or defer Yandex Metrika tracking script (53 KiB unused) until after page load. Tree-shake the Swiper library to include only needed components, reducing 48 KiB waste. Consider replacing jQuery with vanilla JavaScript for simple DOM operations to eliminate 21 KiB overhead.
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Related Performance Analyses
More Generic Speed Tests
Generic Performance Resources
Remove Unused JavaScript Code
120 KiB of unused JavaScript increases bundle size and parsing time without providing functionality.
Optimize Image Delivery Strategy
Large, unoptimized images waste 303 KiB and lack proper dimensions causing layout shifts.
Fix Layout Shift Issues
Unsized media elements are causing 0.117 CLS score from images and videos loading without dimensions.
Optimize Critical Image Delivery
Images are causing 19.2 seconds of LCP delay and using oversized files that are 8.6MB larger than needed.