Tools & Wizards About Us
451books.com screenshot

Report Summary

  • 26

    Performance

    Renders faster than
    45% of other websites

  • 53

    Accessibility

    Visual factors better than
    that of 22% of websites

  • 50

    Best Practices

    More advanced features
    available than in
    19% of websites

  • 58

    SEO

    Google-friendlier than
    21% of websites

451books.com

451ブックス - 古書と洋書とZINEリトルプレス-（古本買取しています）

Page Load Speed

11.7 sec in total

First Response

548 ms

Resources Loaded

10.5 sec

Page Rendered

650 ms

451books.com screenshot

About Website

Welcome to 451books.com homepage info - get ready to check 451 Books best content right away, or after learning these important things about 451books.com

古本買取、古書、洋書、新刊書籍の店。洋書、絵本、専門書、CD、DVD等の買取りを行っています。事前に内容をご連絡いただければ、着払いでのご送付、買取も可能です。

Visit 451books.com

Key Findings

We analyzed 451books.com page load time and found that the first response time was 548 ms and then it took 11.2 sec to load all DOM resources and completely render a web page. This is a poor result, as 90% of websites can load faster.

Performance Metrics

451books.com performance score

26

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value4.6 s

14/100

10%

LCP (Largest Contentful Paint)

Value4.9 s

28/100

25%

SI (Speed Index)

Value7.9 s

22/100

10%

TBT (Total Blocking Time)

Value1,100 ms

24/100

30%

CLS (Cumulative Layout Shift)

Value0.354

31/100

15%

TTI (Time to Interactive)

Value8.6 s

37/100

10%

Network Requests Diagram

451books.com

548 ms

www.451books.com

787 ms

default.css

432 ms

all.js

7 ms

graphic_120_60.jpg

2460 ms

Our browser made a total of 116 requests to load all elements on the main page. We found that 14% of them (16 requests) were addressed to the original 451books.com, 53% (61 requests) were made to Image1.shopserve.jp and 9% (10 requests) were made to Static.xx.fbcdn.net. The less responsive or slowest element that took the longest time to load (5.4 sec) relates to the external source Image1.shopserve.jp.

Page Optimization Overview & Recommendations

Page size can be reduced by 291.7 kB (16%)

Content Size

1.9 MB

After Optimization

1.6 MB

  • HTML
  • Images
  • CSS

In fact, the total size of 451books.com main page is 1.9 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. 45% of websites need less resources to load. Images take 1.7 MB which makes up the majority of the site volume.

HTML Optimization

-84%

Potential reduce by 121.1 kB

  • Original 144.8 kB
  • After minification 113.1 kB
  • After compression 23.7 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. This page needs HTML code to be minified as it can gain 31.6 kB, which is 22% of the original size. It is highly recommended that content of this web page should be compressed using GZIP, as it can save up to 121.1 kB or 84% of the original size.

Image Optimization

-9%

Potential reduce by 151.6 kB

  • Original 1.7 MB
  • After minification 1.6 MB

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. 451 Books images are well optimized though.

CSS Optimization

-86%

Potential reduce by 19.0 kB

  • Original 22.1 kB
  • After minification 13.7 kB
  • After compression 3.1 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. 451books.com needs all CSS files to be minified and compressed as it can save up to 19.0 kB or 86% of the original size.

Requests Breakdown

Number of requests can be reduced by 23 (22%)

Requests Now

106

After Optimization

83

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 106 CSS, Javascripts, AJAX and image requests in order to completely render the main page of 451 Books. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 7 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

451books.com

451books.com

548 ms

www.451books.com

www.451books.com

787 ms

default.css

default.css

432 ms

all.js

all.js

7 ms

graphic_120_60.jpg

graphic_120_60.jpg

2460 ms

show

show

22 ms

art1_120x90.jpg

art1_120x90.jpg

970 ms

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971 ms

bol02_01_120_60.gif

bol02_01_120_60.gif

970 ms

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1304 ms

tralogo_120_120.jpg

tralogo_120_120.jpg

969 ms

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212 ms

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967 ms

tol02_100_100.gif

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1124 ms

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968 ms

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968 ms

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966 ms

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968 ms

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961 ms

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1785 ms

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1400 ms

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1396 ms

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1840 ms

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1791 ms

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1814 ms

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1822 ms

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2114 ms

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2204 ms

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2577 ms

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2577 ms

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2612 ms

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2772 ms

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3099 ms

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3017 ms

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3492 ms

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3454 ms

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3558 ms

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3449 ms

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3890 ms

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4250 ms

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4251 ms

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3915 ms

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4341 ms

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4664 ms

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4728 ms

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4696 ms

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238 ms

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264 ms

spacer.gif

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931 ms

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958 ms

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955 ms

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952 ms

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928 ms

myao.jpg

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929 ms

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931 ms

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930 ms

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8 ms

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947 ms

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934 ms

cm

cm

196 ms

tracking.php

tracking.php

1335 ms

45 ms

xd_arbiter.php

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43 ms

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49 ms

coutorasu.jpg

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4879 ms

like_box.php

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73 ms

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8 ms

719 ms

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23 ms

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33 ms

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615 ms

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52 ms

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52 ms

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4741 ms

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4623 ms

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4586 ms

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4589 ms

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4776 ms

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35 ms

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7 ms

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1480 ms

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6 ms

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4621 ms

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5096 ms

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4626 ms

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4191 ms

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5001 ms

H1.jpg

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4691 ms

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4944 ms

sakogawa.jpg

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4966 ms

itonaomi.jpg

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5355 ms

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5302 ms

sal.jpg

sal.jpg

4376 ms

donkoh01.jpg

donkoh01.jpg

4980 ms

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4975 ms

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4459 ms

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4814 ms

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4886 ms

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4841 ms

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5409 ms

Accessibility Review

451books.com accessibility score

53

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.

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

[id] attributes on active, focusable elements are not unique

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

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

Image elements do not have [alt] attributes

High

Form elements do not have associated labels

High

Links do not have a discernible name

Best Practices

451books.com best practices score

50

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

High

Includes front-end JavaScript libraries with known security vulnerabilities

Low

Ensure CSP is effective against XSS attacks

User Experience

Impact

Issue

High

Serves images with low resolution

General

Impact

Issue

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

High

Issues were logged in the Issues panel in Chrome Devtools

SEO Factors

451books.com SEO score

58

Search Engine Optimization Advices

Crawling and Indexing

To appear in search results, crawlers need access to your app.

Impact

Issue

High

Links are not crawlable

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

    EUC-JP

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise 451books.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 451books.com main page’s claimed encoding is euc-jp. 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

451books.com

Open Graph description is not detected on the main page of 451 Books. 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: