Progressive JPEG Experiment - 1.5Mbps DSL
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All tests were run through a caching transparent proxy and the proxy was seeded with an initial pass of all URLs being tested (the various image permutations are generated on first access).
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Original - Returns all JPEG images as served by the original site
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Optimized - Converts all JPEGs to optimized baseline images (lossless - all meta data stripped out as well)
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Progressive - Converts all JPEGs to optimized progressive images (lossless)
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Truncated - Converts all JPEGs to optimized progressive images and truncates the images after the 5th scan (out of 10)
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onload
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OriginalOptimizedOptimized DeltaProgressiveProgressive DeltaTruncatedTruncated Delta
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Average101679800-367 (-3.61%)9570-597 (-5.87%)8554-1613 (-15.87%)
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25th Percentile42524125-127 (-2.99%)4055-197 (-4.63%)3459-793 (-18.65%)
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50th Percentile72206857-363 (-5.03%)6786-434 (-6.01%)5521-1699 (-23.53%)
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75th Percentile1136510990-375 (-3.30%)10727-638 (-5.61%)8818-2547 (-22.41%)
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95th Percentile3226032216-44 (-0.14%)32051-209 (-0.65%)32014-246 (-0.76%)
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99th Percentile3753035175-2355 (-6.27%)35323-2207 (-5.88%)35291-2239 (-5.97%)
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Test Count1940
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Speed Index
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OriginalOptimizedOptimized DeltaProgressiveProgressive DeltaTruncatedTruncated Delta
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Average47734713-60 (-1.26%)4267-506 (-10.60%)3888-885 (-18.54%)
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25th Percentile21802175-5 (-0.23%)1889-291 (-13.35%)1773-407 (-18.67%)
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50th Percentile37883764-24 (-0.63%)3234-554 (-14.63%)2995-793 (-20.93%)
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75th Percentile57795648-131 (-2.27%)5181-598 (-10.35%)4559-1220 (-21.11%)
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95th Percentile1282512105-720 (-5.61%)11059-1766 (-13.77%)9729-3096 (-24.14%)
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99th Percentile245332456330 (0.12%)24383-150 (-0.61%)23918-615 (-2.51%)
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Test Count1940
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Speed Index (Dev Tools)
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OriginalOptimizedOptimized DeltaProgressiveProgressive DeltaTruncatedTruncated Delta
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Average45574414-143 (-3.14%)4348-209 (-4.59%)4022-535 (-11.74%)
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25th Percentile21972116-81 (-3.69%)2091-106 (-4.82%)1968-229 (-10.42%)
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50th Percentile35723516-56 (-1.57%)3464-108 (-3.02%)3121-451 (-12.63%)
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75th Percentile54725335-137 (-2.50%)5227-245 (-4.48%)4628-844 (-15.42%)
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95th Percentile1141110784-627 (-5.49%)10742-669 (-5.86%)10553-858 (-7.52%)
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99th Percentile2173720543-1194 (-5.49%)21190-547 (-2.52%)20817-920 (-4.23%)
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Test Count1922
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Start Render
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OriginalOptimizedOptimized DeltaProgressiveProgressive DeltaTruncatedTruncated Delta
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Average18961895-1 (-0.05%)18960 (0.00%)1888-8 (-0.42%)
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25th Percentile103010399 (0.87%)1018-12 (-1.17%)10311 (0.10%)
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50th Percentile16821663-19 (-1.13%)1660-22 (-1.31%)1669-13 (-0.77%)
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75th Percentile2424245228 (1.16%)244622 (0.91%)24339 (0.37%)
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95th Percentile41554135-20 (-0.48%)419843 (1.03%)4127-28 (-0.67%)
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99th Percentile67366444-292 (-4.33%)6368-368 (-5.46%)6328-408 (-6.06%)
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Test Count1940
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Time to First Byte
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OriginalOptimizedOptimized DeltaProgressiveProgressive DeltaTruncatedTruncated Delta
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Average521515-6 (-1.15%)512-9 (-1.73%)510-11 (-2.11%)
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25th Percentile1611610 (0.00%)1610 (0.00%)1610 (0.00%)
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50th Percentile3543562 (0.56%)352-2 (-0.56%)3551 (0.28%)
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75th Percentile6316343 (0.48%)6354 (0.63%)627-4 (-0.63%)
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95th Percentile1328135830 (2.26%)1259-69 (-5.20%)1284-44 (-3.31%)
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99th Percentile25512542-9 (-0.35%)25510 (0.00%)2449-102 (-4.00%)
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Test Count1940
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Visually Complete
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OriginalOptimizedOptimized DeltaProgressiveProgressive DeltaTruncatedTruncated Delta
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Average89568463-493 (-5.50%)8339-617 (-6.89%)7290-1666 (-18.60%)
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25th Percentile39003800-100 (-2.56%)3700-200 (-5.13%)3100-800 (-20.51%)
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50th Percentile66006300-300 (-4.55%)6200-400 (-6.06%)5100-1500 (-22.73%)
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75th Percentile1060010100-500 (-4.72%)9800-800 (-7.55%)8100-2500 (-23.58%)
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95th Percentile3180031300-500 (-1.57%)31100-700 (-2.20%)31100-700 (-2.20%)
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99th Percentile3580034300-1500 (-4.19%)34200-1600 (-4.47%)33800-2000 (-5.59%)
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DOM Content Loaded
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OriginalOptimizedOptimized DeltaProgressiveProgressive DeltaTruncatedTruncated Delta
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Average50214937-84 (-1.67%)4767-254 (-5.06%)4751-270 (-5.38%)
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25th Percentile1454147925 (1.72%)147016 (1.10%)1449-5 (-0.34%)
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50th Percentile24462414-32 (-1.31%)2400-46 (-1.88%)2369-77 (-3.15%)
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75th Percentile39163876-40 (-1.02%)3877-39 (-1.00%)3742-174 (-4.44%)
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95th Percentile3100030994-6 (-0.02%)30932-68 (-0.22%)30908-92 (-0.30%)
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99th Percentile3175531727-28 (-0.09%)31752-3 (-0.01%)3180752 (0.16%)
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Bytes In
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OriginalOptimizedOptimized DeltaProgressiveProgressive DeltaTruncatedTruncated Delta
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Average12093901140027-69363 (-5.74%)1123623-85767 (-7.09%)878789-330601 (-27.34%)
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25th Percentile559199540728-18471 (-3.30%)532492-26707 (-4.78%)442969-116230 (-20.79%)
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50th Percentile1000477953023-47454 (-4.74%)943587-56890 (-5.69%)720825-279652 (-27.95%)
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75th Percentile15467591479712-67047 (-4.33%)1450158-96601 (-6.25%)1111086-435673 (-28.17%)
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95th Percentile28347442685060-149684 (-5.28%)2627284-207460 (-7.32%)2125776-708968 (-25.01%)
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99th Percentile47989954233680-565315 (-11.78%)4205268-593727 (-12.37%)3484036-1314959 (-27.40%)
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Summary
onLoad
Speed Index
Speed Index (Dev Tools)
Start Render
TTFB
Visually Complete
DOM Content Loaded