Tools & Wizards About Us
sekaisi.com screenshot

Report Summary

  • 15

    Performance

    Renders faster than
    27% of other websites

  • 54

    Accessibility

    Visual factors better than
    that of 23% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 67

    SEO

    Google-friendlier than
    25% of websites

sekaisi.com

世界史ドットコム

Page Load Speed

21 sec in total

First Response

2.6 sec

Resources Loaded

18 sec

Page Rendered

475 ms

sekaisi.com screenshot

About Website

Visit sekaisi.com now to see the best up-to-date Sekaisi content for Japan and also check out these interesting facts you probably never knew about sekaisi.com

予備校で絶大な支持を受けている講義を公開した「世界史専門ｅラーニングネット予備校」。日本唯一の革命的世界史学習法は、受験生なら飛躍的偏差値アップは当然、全ての方が生涯教育としても学べる高度な内容です。

Visit sekaisi.com

Key Findings

We analyzed Sekaisi.com page load time and found that the first response time was 2.6 sec and then it took 18.4 sec to load all DOM resources and completely render a web page. This is a poor result, as 95% of websites can load faster.

Performance Metrics

sekaisi.com performance score

15

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value6.9 s

1/100

10%

LCP (Largest Contentful Paint)

Value9.0 s

1/100

25%

SI (Speed Index)

Value16.4 s

0/100

10%

TBT (Total Blocking Time)

Value8,750 ms

0/100

30%

CLS (Cumulative Layout Shift)

Value0.016

100/100

15%

TTI (Time to Interactive)

Value24.7 s

0/100

10%

Network Requests Diagram

sekaisi.com

2585 ms

nso_style.css

1760 ms

MCommon.css

758 ms

Tomei.gif

814 ms

Menu01x.gif

819 ms

Our browser made a total of 262 requests to load all elements on the main page. We found that 27% of them (70 requests) were addressed to the original Sekaisi.com, 14% (36 requests) were made to Tsuhan-z.jp and 9% (24 requests) were made to Thinkboard.jp. The less responsive or slowest element that took the longest time to load (9.7 sec) relates to the external source Tsuhan-z.jp.

Page Optimization Overview & Recommendations

Page size can be reduced by 516.0 kB (37%)

Content Size

1.4 MB

After Optimization

860.2 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Sekaisi.com main page is 1.4 MB. This result falls beyond the top 1M of websites and identifies a large and not optimized web page that may take ages to load. 75% of websites need less resources to load and that’s why Accessify’s recommendations for optimization and resource minification can be helpful for this project. Images take 829.4 kB which makes up the majority of the site volume.

HTML Optimization

-82%

Potential reduce by 104.3 kB

  • Original 126.6 kB
  • After minification 122.0 kB
  • After compression 22.3 kB

HTML content can be minified and compressed by a website’s server. The most efficient way is to compress content using GZIP which reduces data amount travelling through the network between server and browser. HTML code on this page is well minified. It is highly recommended that content of this web page should be compressed using GZIP, as it can save up to 104.3 kB or 82% of the original size.

Image Optimization

-17%

Potential reduce by 139.9 kB

  • Original 829.4 kB
  • After minification 689.5 kB

Image size optimization can help to speed up a website loading time. The chart above shows the difference between the size before and after optimization. Obviously, Sekaisi needs image optimization as it can save up to 139.9 kB or 17% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-41%

Potential reduce by 91.3 kB

  • Original 222.1 kB
  • After minification 201.1 kB
  • After compression 130.8 kB

It’s better to minify JavaScript in order to improve website performance. The diagram shows the current total size of all JavaScript files against the prospective JavaScript size after its minification and compression. It is highly recommended that all JavaScript files should be compressed and minified as it can save up to 91.3 kB or 41% of the original size.

CSS Optimization

-91%

Potential reduce by 180.5 kB

  • Original 198.1 kB
  • After minification 146.8 kB
  • After compression 17.6 kB

CSS files minification is very important to reduce a web page rendering time. The faster CSS files can load, the earlier a page can be rendered. Sekaisi.com needs all CSS files to be minified and compressed as it can save up to 180.5 kB or 91% of the original size.

Requests Breakdown

Number of requests can be reduced by 102 (40%)

Requests Now

256

After Optimization

154

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 256 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Sekaisi. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 40 to 1 for JavaScripts and from 13 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

sekaisi.com

sekaisi.com

2585 ms

nso_style.css

nso_style.css

1760 ms

MCommon.css

MCommon.css

758 ms

Tomei.gif

Tomei.gif

814 ms

Menu01x.gif

Menu01x.gif

819 ms

Menu02.gif

Menu02.gif

845 ms

Menu03.gif

Menu03.gif

931 ms

Menu04.gif

Menu04.gif

1001 ms

Menu05.gif

Menu05.gif

1008 ms

Menu06.gif

Menu06.gif

1046 ms

Menu07.gif

Menu07.gif

1105 ms

widgets.js

widgets.js

90 ms

bookmark_button.js

bookmark_button.js

341 ms

plusone.js

plusone.js

69 ms

1399 ms

Menu11.gif

Menu11.gif

1016 ms

Menu12.gif

Menu12.gif

1023 ms

Menu13.gif

Menu13.gif

1069 ms

Menu14.gif

Menu14.gif

1104 ms

Menu15.gif

Menu15.gif

1205 ms

Menu16.gif

Menu16.gif

1216 ms

Menu17.gif

Menu17.gif

1267 ms

Top04.JPG

Top04.JPG

1453 ms

MenuT0101.gif

MenuT0101.gif

1394 ms

MenuT0102.gif

MenuT0102.gif

1405 ms

MenuT1103.gif

MenuT1103.gif

1929 ms

MenuT1104.gif

MenuT1104.gif

1544 ms

MenuT1105.gif

MenuT1105.gif

1615 ms

count

count

349 ms

js2

js2

343 ms

2nd_gets.php

2nd_gets.php

402 ms

get

get

329 ms

index

index

335 ms

button-only.gif

button-only.gif

181 ms

bnr.gif

bnr.gif

618 ms

i2i_pr1.gif

i2i_pr1.gif

359 ms

sogo_ico2.gif

sogo_ico2.gif

356 ms

waku_aqua.gif

waku_aqua.gif

192 ms

BackGround.JPG

BackGround.JPG

183 ms

Top03b.jpg

Top03b.jpg

183 ms

Top01.jpg

Top01.jpg

544 ms

Top(b)ax.gif

Top(b)ax.gif

574 ms

Top(b)g.jpg

Top(b)g.jpg

744 ms

Top(b)b.jpg

Top(b)b.jpg

704 ms

Top(b)c.jpg

Top(b)c.jpg

759 ms

Top(b)e.gif

Top(b)e.gif

921 ms

Top(b)f.jpg

Top(b)f.jpg

657 ms

BannerShigotoIrai.jpg

BannerShigotoIrai.jpg

957 ms

BarRedShort0103.gif

BarRedShort0103.gif

822 ms

Button_KaiinnToroku.gif

Button_KaiinnToroku.gif

880 ms

AmazonJinno.jpg

AmazonJinno.jpg

1095 ms

BannerTWITTER.jpg

BannerTWITTER.jpg

1138 ms

BarRedShort0106.gif

BarRedShort0106.gif

986 ms

BannerNetSemi01.jpg

BannerNetSemi01.jpg

1230 ms

SDC_anime.gif

SDC_anime.gif

5679 ms

BannerTaharaPhysical.jpg

BannerTaharaPhysical.jpg

1148 ms

BannerTokiChemical.jpg

BannerTokiChemical.jpg

1149 ms

BannerARAN.jpg

BannerARAN.jpg

1445 ms

BannerFlashPlayer.gif

BannerFlashPlayer.gif

1328 ms

SDC_anime(B).gif

SDC_anime(B).gif

4493 ms

BarGlay0101.jpg

BarGlay0101.jpg

1314 ms

Dekaji0111.gif

Dekaji0111.gif

1405 ms

BannerTaikenKoza.jpg

BannerTaikenKoza.jpg

1645 ms

Hagaki005.jpg

Hagaki005.jpg

6462 ms

Dekaji0112.gif

Dekaji0112.gif

1579 ms

BarRedLong0101.gif

BarRedLong0101.gif

1619 ms

Dekaji0109.gif

Dekaji0109.gif

1754 ms

IconMaru02.gif

IconMaru02.gif

1795 ms

Dekaji0113.gif

Dekaji0113.gif

1808 ms

Graph_PC.jpg

Graph_PC.jpg

1929 ms

Dekaji0115.gif

Dekaji0115.gif

1984 ms

cb=gapi.loaded_0

cb=gapi.loaded_0

9 ms

cb=gapi.loaded_1

cb=gapi.loaded_1

41 ms

fastbutton

fastbutton

73 ms

cm

cm

255 ms

Dekaji0106.gif

Dekaji0106.gif

1967 ms

215 ms

style.css

style.css

182 ms

user.css.php

user.css.php

442 ms

sample_movie03.html

sample_movie03.html

1423 ms

r6.png

r6.png

340 ms

r4.png

r4.png

349 ms

g4.png

g4.png

357 ms

b4.png

b4.png

360 ms

b8.png

b8.png

382 ms

logo_w.png

logo_w.png

523 ms

postmessageRelay

postmessageRelay

54 ms

cb=gapi.loaded_0

cb=gapi.loaded_0

25 ms

cb=gapi.loaded_1

cb=gapi.loaded_1

23 ms

W5F8_SL0XFawnjxHGsZjJA.ttf

W5F8_SL0XFawnjxHGsZjJA.ttf

39 ms

like.php

like.php

203 ms

3193398744-postmessagerelay.js

3193398744-postmessagerelay.js

23 ms

rpc:shindig_random.js

rpc:shindig_random.js

35 ms

cb=gapi.loaded_0

cb=gapi.loaded_0

3 ms

AmazonLinkWindow

AmazonLinkWindow

369 ms

What_is_New

What_is_New

7270 ms

CheckMark02.gif

CheckMark02.gif

1957 ms

reset.css

reset.css

10 ms

entry-button.css

entry-button.css

11 ms

vbutton-bg.png

vbutton-bg.png

5 ms

510QxVjKJtL._SL100_.jpg

510QxVjKJtL._SL100_.jpg

12 ms

178 ms

buy-from-tan.gif

buy-from-tan.gif

8 ms

qeKvIRsJabD.js

qeKvIRsJabD.js

20 ms

LVx-xkvaJ0b.png

LVx-xkvaJ0b.png

13 ms

icon01.gif

icon01.gif

1817 ms

cm

cm

88 ms

cm

cm

195 ms

cm

cm

178 ms

cm

cm

179 ms

cm

cm

183 ms

61VhfTkN46L._SL100_.jpg

61VhfTkN46L._SL100_.jpg

92 ms

107 ms

cview_out.php

cview_out.php

300 ms

b9.png

b9.png

176 ms

Button_Motto.jpg

Button_Motto.jpg

3952 ms

51aV1VI1-+L._SL100_.jpg

51aV1VI1-+L._SL100_.jpg

46 ms

93 ms

51JNgs7q+HL._SL100_.jpg

51JNgs7q+HL._SL100_.jpg

17 ms

92 ms

cm

cm

88 ms

cm

cm

326 ms

cm

cm

328 ms

BarRedLong0102.gif

BarRedLong0102.gif

3941 ms

51-NaOH9KmL._SL100_.jpg

51-NaOH9KmL._SL100_.jpg

11 ms

154 ms

51k8kx357VL._SL100_.jpg

51k8kx357VL._SL100_.jpg

10 ms

158 ms

Top04b.JPG

Top04b.JPG

4263 ms

51kB+z-Z7rL._SL100_.jpg

51kB+z-Z7rL._SL100_.jpg

9 ms

89 ms

BarGlay0000.gif

BarGlay0000.gif

4011 ms

AmazonDummy.jpg

AmazonDummy.jpg

4545 ms

clear.gif

clear.gif

149 ms

tagimg.gif

tagimg.gif

366 ms

index.html

index.html

1329 ms

51IwjxIgKcL._SL100_.jpg

51IwjxIgKcL._SL100_.jpg

9 ms

88 ms

2014081231385.gif

2014081231385.gif

229 ms

51My+1AxuIL._SL100_.jpg

51My+1AxuIL._SL100_.jpg

8 ms

89 ms

style.css

style.css

854 ms

jquery.min.js

jquery.min.js

5 ms

swfobject_modified.js

swfobject_modified.js

682 ms

jsapi

jsapi

25 ms

in.js

in.js

585 ms

jquery.min.js

jquery.min.js

3 ms

header_bg.gif

header_bg.gif

184 ms

h_nav_img_00.png

h_nav_img_00.png

182 ms

h_nav_img_01.png

h_nav_img_01.png

182 ms

h_nav_img_02.png

h_nav_img_02.png

2491 ms

h_nav_img_03.png

h_nav_img_03.png

2489 ms

logo.png

logo.png

2490 ms

h1_comment.png

h1_comment.png

2489 ms

cse.js

cse.js

31 ms

get_flash_player.gif

get_flash_player.gif

28 ms

h3_mark.gif

h3_mark.gif

2461 ms

TB_con.jpg

TB_con.jpg

2459 ms

banner05.gif

banner05.gif

3155 ms

sample_m_b.png

sample_m_b.png

2963 ms

thinkboard_o_DL.png

thinkboard_o_DL.png

2634 ms

faq_images.png

faq_images.png

2781 ms

price_banner.png

price_banner.png

2638 ms

inquiry_banner.png

inquiry_banner.png

2780 ms

price.png

price.png

2803 ms

ThinkBoard_logo.png

ThinkBoard_logo.png

2821 ms

company_logo.png

company_logo.png

2947 ms

zettalinx_banner.png

zettalinx_banner.png

2949 ms

Share_Site.jpg

Share_Site.jpg

2974 ms

back_top.png

back_top.png

3003 ms

analytics.js

analytics.js

32 ms

cse.js

cse.js

2443 ms

1.gif

1.gif

175 ms

2.gif

2.gif

175 ms

3.gif

3.gif

2452 ms

in.cgi

in.cgi

2431 ms

likebox.php

likebox.php

119 ms

collect

collect

24 ms

hDvwL1_H7g-.css

hDvwL1_H7g-.css

10 ms

56WNbrUYLbL.css

56WNbrUYLbL.css

12 ms

GN27K_co9Wc.css

GN27K_co9Wc.css

18 ms

q68gy-v_YMF.js

q68gy-v_YMF.js

24 ms

FJmpeSpHpjS.js

FJmpeSpHpjS.js

36 ms

0wM5s1Khldu.js

0wM5s1Khldu.js

23 ms

1bNoFZUdlYZ.js

1bNoFZUdlYZ.js

35 ms

OloiM1PZafe.js

OloiM1PZafe.js

34 ms

LTv6ZK-5zxz.js

LTv6ZK-5zxz.js

48 ms

1FCa-btixu2.js

1FCa-btixu2.js

44 ms

Oagsvfb4VWi.js

Oagsvfb4VWi.js

45 ms

pObvZSrFc_4.js

pObvZSrFc_4.js

44 ms

Kt4tkgSRvHH.js

Kt4tkgSRvHH.js

45 ms

H3EKDTObx05.js

H3EKDTObx05.js

45 ms

eR-qA8bp1RM.js

eR-qA8bp1RM.js

45 ms

2982 ms

527591_355036554531817_696347109_n.jpg

527591_355036554531817_696347109_n.jpg

2271 ms

577586_370574286311377_934245345_n.jpg

577586_370574286311377_934245345_n.jpg

54 ms

319384_388146497918627_1409775267_n.jpg

319384_388146497918627_1409775267_n.jpg

54 ms

10628564_1000885976607105_764054615689388409_n.jpg

10628564_1000885976607105_764054615689388409_n.jpg

55 ms

12208806_877647078951912_1133638597529891467_n.jpg

12208806_877647078951912_1133638597529891467_n.jpg

55 ms

1231122_611947748871645_428034331_n.jpg

1231122_611947748871645_428034331_n.jpg

120 ms

1933803_10153324623541587_3296694524738053709_n.jpg

1933803_10153324623541587_3296694524738053709_n.jpg

56 ms

429243_190847097694616_404019487_n.jpg

429243_190847097694616_404019487_n.jpg

55 ms

988554_708373762625243_3188772911442302582_n.jpg

988554_708373762625243_3188772911442302582_n.jpg

57 ms

wL6VQj7Ab77.png

wL6VQj7Ab77.png

29 ms

s7jcwEQH7Sx.png

s7jcwEQH7Sx.png

52 ms

gxbPuQdXIZP.png

gxbPuQdXIZP.png

42 ms

jsapi

jsapi

77 ms

button.0308b81ff1714e446f674b5b9793f2cd.js

button.0308b81ff1714e446f674b5b9793f2cd.js

130 ms

default+ja.css

default+ja.css

11 ms

default.css

default.css

18 ms

default+ja.I.js

default+ja.I.js

44 ms

default.css

default.css

4 ms

I6-MnjEovm5.js

I6-MnjEovm5.js

6 ms

pQrUxxo5oQp.js

pQrUxxo5oQp.js

6 ms

async-ads.js

async-ads.js

29 ms

google_custom_search_watermark.gif

google_custom_search_watermark.gif

40 ms

small-logo.png

small-logo.png

26 ms

search_box_icon.png

search_box_icon.png

28 ms

clear.png

clear.png

27 ms

tweet_button.b9740740e0bcf9b0657c5b11bd4388da.ja.html

tweet_button.b9740740e0bcf9b0657c5b11bd4388da.ja.html

38 ms

ranking.css

ranking.css

348 ms

sbm.js

sbm.js

1826 ms

referer.js

referer.js

360 ms

sagasu.gif

sagasu.gif

369 ms

navib1.gif

navib1.gif

371 ms

navib2.gif

navib2.gif

383 ms

jot

jot

87 ms

navib3.gif

navib3.gif

541 ms

rcr.gif

rcr.gif

571 ms

img.php

img.php

963 ms

itmb.gif

itmb.gif

567 ms

itmb3.gif

itmb3.gif

614 ms

itmb2.gif

itmb2.gif

687 ms

img.php

img.php

1321 ms

img.php

img.php

810 ms

img.php

img.php

1949 ms

img.php

img.php

1657 ms

img.php

img.php

1175 ms

img.php

img.php

1803 ms

img.php

img.php

1263 ms

img.php

img.php

2496 ms

img.php

img.php

9670 ms

img.php

img.php

1766 ms

img.php

img.php

2075 ms

img.php

img.php

2430 ms

shutten2.gif

shutten2.gif

2109 ms

dell.gif

dell.gif

2688 ms

Credit_Rakuten.jpg

Credit_Rakuten.jpg

353 ms

iPCOSS.gif

iPCOSS.gif

359 ms

header_new.php

header_new.php

1121 ms

item_search_b.php

item_search_b.php

1209 ms

sback.gif

sback.gif

1329 ms

midashiback.gif

midashiback.gif

1445 ms

img.php

img.php

1782 ms

komidashi.gif

komidashi.gif

1714 ms

ftr.gif

ftr.gif

1801 ms

ga.js

ga.js

11 ms

__utm.gif

__utm.gif

25 ms

bgt

bgt

900 ms

0.gif

0.gif

938 ms

toptitle.png

toptitle.png

1344 ms

dum.gif

dum.gif

868 ms

Accessibility Review

sekaisi.com accessibility score

54

Accessibility Issues

Contrast

These are opportunities to improve the legibility of your content.

Impact

Issue

High

Background and foreground colors do not have a sufficient contrast ratio.

Names and labels

These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.

Impact

Issue

High

<frame> or <iframe> elements do not have a title

High

Image elements do not have [alt] attributes

High

Form elements do not have associated labels

High

Links do not have a discernible name

Internationalization and localization

These are opportunities to improve the interpretation of your content by users in different locales.

Impact

Issue

High

<html> element does not have a [lang] attribute

Best Practices

sekaisi.com best practices score

67

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

User Experience

Impact

Issue

High

Serves images with low resolution

General

Impact

Issue

High

Browser errors were logged to the console

SEO Factors

sekaisi.com SEO score

67

Search Engine Optimization Advices

Content Best Practices

Format your HTML in a way that enables crawlers to better understand your app’s content.

Impact

Issue

High

Image elements do not have [alt] attributes

Language and Encoding

  • Language Detected

    JA

  • Language Claimed

    N/A

  • Encoding

    SHIFT_JIS

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Sekaisi.com can be misinterpreted by Google and other search engines. Our service has detected that Japanese is used on the page, and neither this language nor any other was claimed in <html> or <meta> tags. Our system also found out that Sekaisi.com main page’s claimed encoding is shift_jis. Changing it to UTF-8 can be a good choice, as this format is commonly used for encoding all over the web and thus their visitors won’t have any troubles with symbol transcription or reading.

Social Sharing Optimization

sekaisi.com

Open Graph description is not detected on the main page of Sekaisi. Lack of Open Graph description can be counter-productive for their social media presence, as such a description allows converting a website homepage (or other pages) into good-looking, rich and well-structured posts, when it is being shared on Facebook and other social media. For example, adding the following code snippet into HTML <head> tag will help to represent this web page correctly in social networks: