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June 2018
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Optimizing Images on Alexa’s Top 100 Global Sites

Przemek MatyllaPrzemek Matylla

At Kraken.io we are pretty good at image optimization. This time we checked how well Alexa’s Top 100 Global Sites are optimized. On the 3rd of July 2014 we crawled those 100 websites and optimized all of their images – not only those found in img src but also those from CSS files (background images).

On average we were able to save 12% and 33% (lossless and lossy)  with proper image optimization on Alexa’s top 100 ranked sites.

Surprisingly there are only five websites in the top 100 which send WebP images to compatible browsers: Youtube.com, Yandex.ru, Ebay.com, Fifa.com and Odnoklassniki.ru.

The following table shows optimization results for each crawled website. You can download the detailed report for each website in the CSV format here.

Website Images Original Lossless (% Savings) Lossy (% Savings)
TOTAL 5069 80.37 MB 70.51 MB (12.26%) 53.81 MB (33.04%)
1. google.com 6 297.91 KB 196.34 KB (34.09%) 126.89 KB (57.41%)
2. facebook.com 81 554.12 KB 520.58 KB (6.05%) 476.26 KB (14.05%)
3. youtube.com 44 308.84 KB 212.57 KB (31.17%) 207.33 KB (32.87%)
4. yahoo.com 52 937.89 KB 892.52 KB (4.84%) 736.64 KB (21.46%)
5. baidu.com 3 10.34 KB 7.12 KB (31.16%) 3.96 KB (61.69%)
6. wikipedia.org 15 155.91 KB 150.21 KB (3.66%) 71.86 KB (53.91%)
7. qq.com 136 1.29 MB 1.13 MB (12.73%) 705.63 KB (46.64%)
8. twitter.com 18 376.75 KB 268.43 KB (28.75%) 142.19 KB (62.26%)
9. taobao.com 81 2.51 MB 2.32 MB (7.39%) 1.35 MB (46.01%)
10. amazon.com 116 2.65 MB 2.54 MB (4.25%) 1.61 MB (39.51%)
11. live.com 5 495.39 KB 354.51 KB (28.44%) 101.65 KB (79.48%)
12. linkedin.com 65 205.74 KB 177.78 KB (13.59%) 159.17 KB (22.64%)
13. google.co.in
14. sina.com.cn 82 1.65 MB 1.57 MB (4.87%) 1.05 MB (36.48%)
15. hao123.com 42 531.10 KB 438.68 KB (17.40%) 307.30 KB (42.14%)
16. weibo.com 49 605.09 KB 507.63 KB (16.11%) 486.12 KB (19.66%)
17. blogspot.com
18. tmall.com 125 1.76 MB 1.68 MB (4.91%) 1.18 MB (32.91%)
19. sohu.com 100 755.55 KB 630.56 KB (16.54%) 432.14 KB (42.80%)
20. yahoo.co.jp 9 35.62 KB 33.29 KB (6.54%) 29.59 KB (16.94%)
21. yandex.ru 6 28.16 KB 26.86 KB (4.61%) 9.65 KB (65.72%)
22. vk.com 6 203.07 KB 200.49 KB (1.27%) 194.33 KB (4.30%)
23. bing.com
24. wordpress.com 2 186.93 KB 186.93 KB (0.00%) 186.93 KB (0.00%)
25. google.de
26. pinterest.com 4 485.94 KB 458.25 KB (5.70%) 257.25 KB (47.06%)
27. ebay.com 147 1.12 MB 1016.36 KB (11.58%) 659.90 KB (42.59%)
28. 360.cn 20 609.84 KB 584.71 KB (4.12%) 307.57 KB (49.57%)
29. google.co.uk
30. google.co.jp
31. instagram.com 10 178.91 KB 178.88 KB (0.02%) 178.88 KB (0.02%)
32. google.fr
33. soso.com 4 13.35 KB 9.14 KB (31.51%) 6.68 KB (49.93%)
34. 163.com 187 1.86 MB 1.75 MB (6.05%) 1.35 MB (27.59%)
35. msn.com 110 351.80 KB 305.16 KB (13.26%) 288.00 KB (18.14%)
36. ask.com 2 9.62 KB 5.88 KB (38.88%) 4.31 KB (55.24%)
37. tumblr.com 7 1.10 MB 1023.22 KB (9.08%) 873.15 KB (22.42%)
38. google.com.br
39. mail.ru 31 143.38 KB 137.38 KB (4.19%) 98.53 KB (31.28%)
40. microsoft.com 32 380.96 KB 342.62 KB (10.06%) 268.01 KB (29.65%)
41. paypal.com 11 1.03 MB 1.00 MB (2.85%) 701.85 KB (33.45%)
42. google.ru
43. xvideos.com 139 1000.66 KB 976.46 KB (2.42%) 908.62 KB (9.20%)
44. google.it
45. apple.com 26 4.36 MB 4.14 MB (5.10%) 2.90 MB (33.53%)
46. google.es
47. imgur.com 124 2.08 MB 1.94 MB (6.97%) 1.44 MB (30.94%)
48. imdb.com 75 918.66 KB 847.84 KB (7.71%) 770.87 KB (16.09%)
49. craigslist.org
50. neobux.com 7 68.43 KB 62.15 KB (9.18%) 54.53 KB (20.32%)
51. stackoverflow.com 7 188.08 KB 156.66 KB (16.71%) 160.67 KB (14.58%)
52. adcash.com 10 335.08 KB 242.49 KB (27.63%) 150.25 KB (55.16%)
53. amazon.co.jp 79 2.08 MB 2.04 MB (1.97%) 1.41 MB (32.22%)
54. reddit.com 26 94.67 KB 86.41 KB (8.73%) 60.77 KB (35.81%)
55. t.co
56. google.com.mx
57. xhamster.com 118 3.42 MB 3.22 MB (5.73%) 2.88 MB (15.65%)
58. people.com.cn 97 865.03 KB 743.51 KB (14.05%) 579.20 KB (33.04%)
59. go.com 24 641.50 KB 541.60 KB (15.57%) 283.13 KB (55.86%)
60. google.ca
61. fc2.com 8 318.42 KB 282.89 KB (11.16%) 151.66 KB (52.37%)
62. adobe.com 9 520.42 KB 520.29 KB (0.03%) 367.81 KB (29.32%)
63. bbc.co.uk 38 458.23 KB 326.65 KB (28.71%) 320.43 KB (30.07%)
64. xinhuanet.com 190 2.90 MB 2.36 MB (18.70%) 1.74 MB (40.11%)
65. cnn.com 78 705.97 KB 507.46 KB (28.12%) 383.51 KB (45.68%)
66. aliexpress.com 128 2.08 MB 1.81 MB (12.94%) 1.22 MB (41.32%)
67. blogger.com 13 259.51 KB 207.28 KB (20.13%) 154.98 KB (40.28%)
68. ifeng.com 70 490.24 KB 442.67 KB (9.70%) 386.84 KB (21.09%)
69. google.co.id
70. wordpress.org 11 429.68 KB 386.97 KB (9.94%) 135.44 KB (68.48%)
71. godaddy.com 15 488.21 KB 483.84 KB (0.89%) 284.82 KB (41.66%)
72. googleusercontent.com
73. alibaba.com 34 237.73 KB 216.63 KB (8.88%) 158.45 KB (33.35%)
74. google.com.tr
75. vube.com 81 2.64 MB 2.52 MB (4.75%) 2.02 MB (23.67%)
76. huffingtonpost.com 127 2.61 MB 1.78 MB (31.80%) 1.48 MB (43.53%)
77. fifa.com 143 1.96 MB 1.72 MB (12.25%) 1.33 MB (32.01%)
78. espn.go.com 78 594.63 KB 499.79 KB (15.95%) 371.29 KB (37.56%)
79. odnoklassniki.ru 6 133.10 KB 126.45 KB (5.00%) 123.94 KB (6.88%)
80. pornhub.com 46 447.80 KB 425.75 KB (4.92%) 320.63 KB (28.40%)
81. amazon.de 57 562.40 KB 505.50 KB (10.12%) 393.02 KB (30.12%)
82. kickass.to 7 77.32 KB 72.69 KB (6.00%) 34.07 KB (55.94%)
83. google.com.au
84. thepiratebay.se 3 11.14 KB 10.62 KB (4.69%) 6.55 KB (41.16%)
85. netflix.com 6 113.05 KB 103.09 KB (8.82%) 76.23 KB (32.57%)
86. akamaihd.net
87. google.pl
88. ebay.de 105 1.87 MB 1.75 MB (6.35%) 1.52 MB (18.71%)
89. chinadaily.com.cn 54 1.41 MB 1.23 MB (12.27%) 1.01 MB (28.10%)
90. dailymotion.com 63 477.83 KB 463.58 KB (2.98%) 459.33 KB (3.87%)
91. clkmon.com 2 5.88 KB 5.86 KB (0.37%) 3.38 KB (42.52%)
92. about.com 93 2.09 MB 1.91 MB (8.55%) 1.65 MB (21.08%)
93. google.com.hk
94. gmw.cn 49 469.45 KB 294.29 KB (37.31%) 342.63 KB (27.01%)
95. dailymail.co.uk 517 8.21 MB 7.58 MB (7.65%) 7.03 MB (14.35%)
96. bp.blogspot.com
97. rakuten.co.jp 469 5.37 MB 3.95 MB (26.37%) 2.35 MB (56.17%)
98. xnxx.com 194 1.53 MB 1.49 MB (2.61%) 1.37 MB (10.99%)
99. alipay.com 9 827.20 KB 769.70 KB (6.95%) 514.28 KB (37.83%)
100. vimeo.com 26 366.48 KB 362.88 KB (0.98%) 334.02 KB (8.86%)

CEO and Co-Founder at Kraken.io

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