Details for http://www.plaxo.com/

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B (80)
Current YSlow grade: B (80)
 A (92)
Current Page Speed score: A (92)

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Measurements over time

YSlow metrics
Basic measurements
B (80%)
764KB
69 0 ms
Best practices
Make fewer HTTP requests F (13%)
Use a Content Delivery Network (CDN) F (0%)
Add Expires headers F (45%)
Avoid Empty Image src A (100%)
Compress components with gzip A (100%)
Put CSS at top A (100%)
Put JavaScript at bottom C (75%)
Avoid CSS expressions B (88%)
Make JavaScript and CSS external F (0%)
Reduce DNS lookups D (60%)
Minify JavaScript and CSS C (70%)
Avoid URL redirects B (80%)
Remove duplicate JavaScript and CSS A (100%)
Configure entity tags (ETags) B (89%)
Make AJAX cacheable A (100%)
Use GET for AJAX requests A (100%)
Reduce the number of DOM elements A (100%)
Avoid HTTP 404 (Not Found) error A (100%)
Reduce cookie size A (100%)
Use cookie-free domains B (85%)
Avoid AlphaImageLoader filter A (100%)
Do not scale images in HTML A (100%)
Make favicon small and cacheable A (100%)
Page Speed metrics
Basic measurements
1711KB 4980 ms
763KB 69
A (92%)
Optimize caching
Leverage browser caching A (93%)
Leverage proxy caching A (98%)
Remove query strings from static resources B (89%)
Specify a Vary: Accept-Encoding header A (93%)
Minimize round-trip times
Minimize DNS lookups n/a Minimize redirects B (85%)
Avoid bad requests A (100%)
Combine external JavaScript n/a
Combine external CSS n/a Combine images using CSS sprites F (0%)
Optimize the order of styles and scripts A (100%)
Avoid document.write n/a
Avoid CSS @import A (100%)
Prefer asynchronous resources B (85%)
Parallelize downloads across hostnames n/a
Minimize request overhead
Minimize request size A (100%)
Serve static content from a cookieless domain n/a
Minimize payload size
Enable compression A (100%)
Remove unused CSS F (47.7%)
Minify JavaScript A (98%)
Minify CSS A (100%)
Minify HTML A (98%)
Defer loading of JavaScript n/a
Optimize images A (98%)
Serve scaled images A (100%)
Serve resources from a consistent URL A (91%)
Optimize browser rendering
Use efficient CSS selectors F (0%)
Put CSS in the document head A (100%)
Specify image dimensions F (0%)
Specify a character set early A (100%)

YSlow measurements history (csv)

Page Speed measurements history (csv)