Progressive JPEG Experiment - 5Mbps Cable
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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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Average52945484190 (3.59%)539197 (1.83%)5230-64 (-1.21%)
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25th Percentile19431914-29 (-1.49%)1937-6 (-0.31%)1754-189 (-9.73%)
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50th Percentile30252960-65 (-2.15%)2931-94 (-3.11%)2682-343 (-11.34%)
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75th Percentile47024573-129 (-2.74%)4567-135 (-2.87%)4207-495 (-10.53%)
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95th Percentile3108431029-55 (-0.18%)31051-33 (-0.11%)3110218 (0.06%)
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99th Percentile3269132800109 (0.33%)32856165 (0.50%)32688-3 (-0.01%)
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Test Count1946
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Speed Index
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OriginalOptimizedOptimized DeltaProgressiveProgressive DeltaTruncatedTruncated Delta
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Average2413250390 (3.73%)2338-75 (-3.11%)2404-9 (-0.37%)
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25th Percentile110711070 (0.00%)1042-65 (-5.87%)1012-95 (-8.58%)
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50th Percentile17491729-20 (-1.14%)1622-127 (-7.26%)1560-189 (-10.81%)
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75th Percentile2605264944 (1.69%)2501-104 (-3.99%)2390-215 (-8.25%)
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95th Percentile54595602143 (2.62%)5825366 (6.70%)550950 (0.92%)
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99th Percentile19490209801490 (7.64%)17885-1605 (-8.23%)226743184 (16.34%)
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Speed Index (Dev Tools)
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OriginalOptimizedOptimized DeltaProgressiveProgressive DeltaTruncatedTruncated Delta
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Average2490254050 (2.01%)251828 (1.12%)250818 (0.72%)
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25th Percentile11501146-4 (-0.35%)11577 (0.61%)1088-62 (-5.39%)
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50th Percentile17781752-26 (-1.46%)1756-22 (-1.24%)1658-120 (-6.75%)
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75th Percentile26742659-15 (-0.56%)269016 (0.60%)2582-92 (-3.44%)
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95th Percentile66167456840 (12.70%)6983367 (5.55%)76991083 (16.37%)
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99th Percentile1678317453670 (3.99%)16694-89 (-0.53%)184151632 (9.72%)
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Start Render
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OriginalOptimizedOptimized DeltaProgressiveProgressive DeltaTruncatedTruncated Delta
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Average114911512 (0.17%)11567 (0.61%)11490 (0.00%)
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25th Percentile619613-6 (-0.97%)6201 (0.16%)604-15 (-2.42%)
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50th Percentile963959-4 (-0.42%)961-2 (-0.21%)957-6 (-0.62%)
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75th Percentile1396141115 (1.07%)140711 (0.79%)140711 (0.79%)
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95th Percentile26472592-55 (-2.08%)2561-86 (-3.25%)26525 (0.19%)
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99th Percentile42034417214 (5.09%)423532 (0.76%)4127-76 (-1.81%)
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Time to First Byte
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OriginalOptimizedOptimized DeltaProgressiveProgressive DeltaTruncatedTruncated Delta
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Average4154205 (1.20%)44025 (6.02%)4227 (1.69%)
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25th Percentile85850 (0.00%)850 (0.00%)850 (0.00%)
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50th Percentile274269-5 (-1.82%)2751 (0.36%)2762 (0.73%)
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75th Percentile531528-3 (-0.56%)5343 (0.56%)5409 (1.69%)
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95th Percentile1191123544 (3.69%)123241 (3.44%)122433 (2.77%)
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99th Percentile24272541114 (4.70%)2571144 (5.93%)2580153 (6.30%)
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Visually Complete
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OriginalOptimizedOptimized DeltaProgressiveProgressive DeltaTruncatedTruncated Delta
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Average4431449463 (1.42%)4394-37 (-0.84%)4283-148 (-3.34%)
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25th Percentile18001700-100 (-5.56%)1700-100 (-5.56%)1500-300 (-16.67%)
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50th Percentile28002700-100 (-3.57%)2700-100 (-3.57%)2400-400 (-14.29%)
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75th Percentile43004100-200 (-4.65%)4200-100 (-2.33%)3800-500 (-11.63%)
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95th Percentile13200166003400 (25.76%)158002600 (19.70%)170003800 (28.79%)
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99th Percentile3250032300-200 (-0.62%)325000 (0.00%)325000 (0.00%)
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DOM Content Loaded
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OriginalOptimizedOptimized DeltaProgressiveProgressive DeltaTruncatedTruncated Delta
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Average32313449218 (6.75%)3450219 (6.78%)3537306 (9.47%)
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25th Percentile784780-4 (-0.51%)7939 (1.15%)7862 (0.26%)
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50th Percentile13221320-2 (-0.15%)134927 (2.04%)13286 (0.45%)
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75th Percentile2115212611 (0.52%)216954 (2.55%)21161 (0.05%)
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95th Percentile23566304236857 (29.10%)304116845 (29.05%)304966930 (29.41%)
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99th Percentile3114031355215 (0.69%)31487347 (1.11%)3118545 (0.14%)
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Bytes In
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OriginalOptimizedOptimized DeltaProgressiveProgressive DeltaTruncatedTruncated Delta
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Average11856661118364-67302 (-5.68%)1104495-81171 (-6.85%)867739-317927 (-26.81%)
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25th Percentile565412536732-28680 (-5.07%)538522-26890 (-4.76%)444448-120964 (-21.39%)
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50th Percentile988913939568-49345 (-4.99%)931716-57197 (-5.78%)721181-267732 (-27.07%)
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75th Percentile14887371418198-70539 (-4.74%)1387719-101018 (-6.79%)1085802-402935 (-27.07%)
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95th Percentile28069002667182-139718 (-4.98%)2620871-186029 (-6.63%)2109420-697480 (-24.85%)
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99th Percentile48308264515008-315818 (-6.54%)4444433-386393 (-8.00%)3491817-1339009 (-27.72%)
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Summary
onLoad
Speed Index
Speed Index (Dev Tools)
Start Render
TTFB
Visually Complete
DOM Content Loaded