Tools & Wizards About Us
bombsight.org screenshot

Report Summary

  • 60

    Performance

    Renders faster than
    75% of other websites

  • 68

    Accessibility

    Visual factors better than
    that of 33% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 81

    SEO

    Google-friendlier than
    43% of websites

bombsight.org

Bomb Sight - Mapping the World War 2 London Blitz Bomb Census

Page Load Speed

2.8 sec in total

First Response

62 ms

Resources Loaded

2.6 sec

Page Rendered

194 ms

bombsight.org screenshot

About Website

Visit bombsight.org now to see the best up-to-date Bomb Sight content for United Kingdom and also check out these interesting facts you probably never knew about bombsight.org

Bomb Sight makes you discover London during WW2 Luftwaffe Blitz bombing raids, exploring maps, images and memories. The Bomb Sight web map and mobile app reveals WW2 bomb census maps between 7/10/1940...

Visit bombsight.org

Key Findings

We analyzed Bombsight.org page load time and found that the first response time was 62 ms and then it took 2.8 sec to load all DOM resources and completely render a web page. This is a poor result, as 50% of websites can load faster.

Performance Metrics

bombsight.org performance score

60

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.6 s

31/100

10%

LCP (Largest Contentful Paint)

Value5.5 s

18/100

25%

SI (Speed Index)

Value7.7 s

25/100

10%

TBT (Total Blocking Time)

Value130 ms

96/100

30%

CLS (Cumulative Layout Shift)

Value0.012

100/100

15%

TTI (Time to Interactive)

Value6.0 s

65/100

10%

Network Requests Diagram

bombsight.org

62 ms

af36c546f0d6.css

285 ms

css

20 ms

69277132e140.js

559 ms

dfcd2c7d6b09.css

681 ms

Our browser made a total of 169 requests to load all elements on the main page. We found that 1% of them (1 request) were addressed to the original Bombsight.org, 48% (81 requests) were made to Geoserver.bombsight.org and 22% (37 requests) were made to Static.prod.bombsight.org. The less responsive or slowest element that took the longest time to load (1.4 sec) relates to the external source Static.prod.bombsight.org.

Page Optimization Overview & Recommendations

Page size can be reduced by 77.1 kB (6%)

Content Size

1.3 MB

After Optimization

1.2 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Bombsight.org main page is 1.3 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. 65% of websites need less resources to load. Images take 1.1 MB which makes up the majority of the site volume.

HTML Optimization

-79%

Potential reduce by 31.7 kB

  • Original 40.0 kB
  • After minification 36.0 kB
  • After compression 8.3 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 31.7 kB or 79% of the original size.

Image Optimization

-4%

Potential reduce by 45.0 kB

  • Original 1.1 MB
  • After minification 1.1 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. Bomb Sight images are well optimized though.

JavaScript Optimization

-0%

Potential reduce by 405 B

  • Original 117.7 kB
  • After minification 117.7 kB
  • After compression 117.2 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. This website has mostly compressed JavaScripts.

CSS Optimization

-0%

Potential reduce by 10 B

  • Original 26.0 kB
  • After minification 26.0 kB
  • After compression 25.9 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. Bombsight.org has all CSS files already compressed.

Requests Breakdown

Number of requests can be reduced by 13 (16%)

Requests Now

83

After Optimization

70

  • Images
  • JavaScript
  • CSS

The browser has sent 83 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Bomb Sight. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 4 to 1 for JavaScripts and from 4 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

bombsight.org

bombsight.org

62 ms

af36c546f0d6.css

af36c546f0d6.css

285 ms

css

css

20 ms

69277132e140.js

69277132e140.js

559 ms

dfcd2c7d6b09.css

dfcd2c7d6b09.css

681 ms

addthis_widget.js

addthis_widget.js

142 ms

2395bfa544ff.js

2395bfa544ff.js

582 ms

ga.js

ga.js

29 ms

logo_upo.png

logo_upo.png

108 ms

bombsight_mappingww2.png

bombsight_mappingww2.png

261 ms

bombsight_responsive.png

bombsight_responsive.png

259 ms

nav_dots.gif

nav_dots.gif

258 ms

nav_arrow.gif

nav_arrow.gif

255 ms

ajax-loader.gif

ajax-loader.gif

262 ms

pan_controls.gif

pan_controls.gif

311 ms

zoom_controls.gif

zoom_controls.gif

522 ms

layers.png

layers.png

497 ms

bomb_generic.png

bomb_generic.png

494 ms

legend_icon2.png

legend_icon2.png

509 ms

defence_generic_sml.png

defence_generic_sml.png

523 ms

defence_aggregate.png

defence_aggregate.png

553 ms

defence_tank.png

defence_tank.png

718 ms

defence_personnel.png

defence_personnel.png

744 ms

defence_plane.png

defence_plane.png

752 ms

defence_ancillary.png

defence_ancillary.png

766 ms

bomb_generic_sml.png

bomb_generic_sml.png

759 ms

aggregate_double.png

aggregate_double.png

792 ms

bomb_incendiary.png

bomb_incendiary.png

939 ms

bomb_parachute.png

bomb_parachute.png

975 ms

social_twitter.png

social_twitter.png

999 ms

social_wpress.png

social_wpress.png

995 ms

social_youtube.png

social_youtube.png

998 ms

logo_nationalarchive.png

logo_nationalarchive.png

308 ms

logo_jisc.png

logo_jisc.png

109 ms

glyphicons-halflings.png

glyphicons-halflings.png

990 ms

icons.png

icons.png

1150 ms

u-4n0qyriQwlOrhSvowK_l52_wFZWMf_.ttf

u-4n0qyriQwlOrhSvowK_l52_wFZWMf_.ttf

67 ms

u-4n0qyriQwlOrhSvowK_l52xwNZWMf_.ttf

u-4n0qyriQwlOrhSvowK_l52xwNZWMf_.ttf

79 ms

u-440qyriQwlOrhSvowK_l5-fCZJ.ttf

u-440qyriQwlOrhSvowK_l5-fCZJ.ttf

80 ms

AerialWithLabels

AerialWithLabels

157 ms

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50 ms

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51 ms

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51 ms

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173 ms

ows

ows

128 ms

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44 ms

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135 ms

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268 ms

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269 ms

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278 ms

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257 ms

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265 ms

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363 ms

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393 ms

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379 ms

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387 ms

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381 ms

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400 ms

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476 ms

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493 ms

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500 ms

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503 ms

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507 ms

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516 ms

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594 ms

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614 ms

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616 ms

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638 ms

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627 ms

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632 ms

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712 ms

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732 ms

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740 ms

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745 ms

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749 ms

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753 ms

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38 ms

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42 ms

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39 ms

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49 ms

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49 ms

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48 ms

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47 ms

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51 ms

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51 ms

pan-up.png

pan-up.png

1117 ms

pan-left.png

pan-left.png

1145 ms

pan-right.png

pan-right.png

1142 ms

pan-down.png

pan-down.png

1147 ms

zoom-in.png

zoom-in.png

1146 ms

zoom-slider.png

zoom-slider.png

1324 ms

zoom-out.png

zoom-out.png

1359 ms

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40 ms

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47 ms

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51 ms

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38 ms

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44 ms

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48 ms

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50 ms

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50 ms

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720 ms

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727 ms

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736 ms

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732 ms

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725 ms

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730 ms

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722 ms

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722 ms

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719 ms

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715 ms

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721 ms

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710 ms

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693 ms

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712 ms

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722 ms

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719 ms

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712 ms

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706 ms

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700 ms

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740 ms

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727 ms

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721 ms

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723 ms

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701 ms

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695 ms

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718 ms

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723 ms

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724 ms

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718 ms

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723 ms

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690 ms

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722 ms

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737 ms

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729 ms

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724 ms

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728 ms

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686 ms

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721 ms

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772 ms

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724 ms

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726 ms

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726 ms

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690 ms

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718 ms

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728 ms

f346201c4912.css

f346201c4912.css

246 ms

Accessibility Review

bombsight.org accessibility score

68

Accessibility Issues

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

Buttons do not have an accessible name

High

Image elements do not have [alt] attributes

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

These items highlight common accessibility best practices.

Impact

Issue

High

[user-scalable="no"] is used in the <meta name="viewport"> element or the [maximum-scale] attribute is less than 5.

Best Practices

bombsight.org best practices score

67

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

SEO Factors

bombsight.org SEO score

81

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

Mobile Friendly

Make sure your pages are mobile friendly so users don’t have to pinch or zoom in order to read the content pages. [Learn more](https://developers.google.com/search/mobile-sites/).

Impact

Issue

High

Document uses legible font sizes

High

Tap targets are not sized appropriately

Language and Encoding

  • Language Detected

    EN

  • Language Claimed

    N/A

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Bombsight.org can be misinterpreted by Google and other search engines. Our service has detected that English 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 Bombsight.org main page’s claimed encoding is utf-8. Use of this encoding format is the best practice as the main page visitors from all over the world won’t have any issues with symbol transcription.

Social Sharing Optimization

bombsight.org

Open Graph data is detected on the main page of Bomb Sight. This is the best way to make the web page social media friendly. Here is how it looks like on Facebook: