Tools & Wizards About Us
letterboxlab.com screenshot

Report Summary

  • 50

    Performance

    Renders faster than
    68% of other websites

  • 84

    Accessibility

    Visual factors better than
    that of 56% of websites

  • 92

    Best Practices

    More advanced features
    available than in
    80% of websites

  • 86

    SEO

    Google-friendlier than
    60% of websites

letterboxlab.com

Kids Science Kits & STEM Subscription Boxes | Letterbox Lab

Page Load Speed

3.7 sec in total

First Response

183 ms

Resources Loaded

2.4 sec

Page Rendered

1 sec

letterboxlab.com screenshot

About Website

Welcome to letterboxlab.com homepage info - get ready to check Letterbox Lab best content right away, or after learning these important things about letterboxlab.com

Fun science experiments for kids that come with everything you need to play with science. Purchase as a science subscription box or individually.

Visit letterboxlab.com

Key Findings

We analyzed Letterboxlab.com page load time and found that the first response time was 183 ms and then it took 3.5 sec to load all DOM resources and completely render a web page. This is a poor result, as 60% of websites can load faster.

Performance Metrics

letterboxlab.com performance score

50

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value4.0 s

23/100

10%

LCP (Largest Contentful Paint)

Value10.9 s

0/100

25%

SI (Speed Index)

Value5.4 s

56/100

10%

TBT (Total Blocking Time)

Value240 ms

85/100

30%

CLS (Cumulative Layout Shift)

Value0.088

93/100

15%

TTI (Time to Interactive)

Value9.3 s

31/100

10%

Network Requests Diagram

letterboxlab.com

183 ms

www.letterboxlab.com

445 ms

index.css

79 ms

style.min.css

162 ms

woocommerce-layout.css

238 ms

Our browser made a total of 91 requests to load all elements on the main page. We found that 93% of them (85 requests) were addressed to the original Letterboxlab.com, 3% (3 requests) were made to Fonts.gstatic.com and 1% (1 request) were made to Fonts.googleapis.com. The less responsive or slowest element that took the longest time to load (727 ms) belongs to the original domain Letterboxlab.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 233.4 kB (12%)

Content Size

1.9 MB

After Optimization

1.7 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Letterboxlab.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. 65% of websites need less resources to load. Images take 1.5 MB which makes up the majority of the site volume.

HTML Optimization

-81%

Potential reduce by 87.5 kB

  • Original 107.3 kB
  • After minification 105.2 kB
  • After compression 19.9 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 87.5 kB or 81% of the original size.

Image Optimization

-2%

Potential reduce by 29.8 kB

  • Original 1.5 MB
  • After minification 1.5 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. Letterbox Lab images are well optimized though.

JavaScript Optimization

-22%

Potential reduce by 146 B

  • Original 653 B
  • After minification 653 B
  • After compression 507 B

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 146 B or 22% of the original size.

CSS Optimization

-42%

Potential reduce by 116.0 kB

  • Original 277.4 kB
  • After minification 277.2 kB
  • After compression 161.4 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. Letterboxlab.com needs all CSS files to be minified and compressed as it can save up to 116.0 kB or 42% of the original size.

Requests Breakdown

Number of requests can be reduced by 49 (58%)

Requests Now

84

After Optimization

35

  • Images
  • JavaScript
  • CSS

The browser has sent 84 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Letterbox Lab. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 27 to 1 for JavaScripts and from 24 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

letterboxlab.com

letterboxlab.com

183 ms

www.letterboxlab.com

www.letterboxlab.com

445 ms

index.css

index.css

79 ms

style.min.css

style.min.css

162 ms

woocommerce-layout.css

woocommerce-layout.css

238 ms

woocommerce.css

woocommerce.css

246 ms

wpmenucart-icons.min.css

wpmenucart-icons.min.css

251 ms

wpmenucart-main.min.css

wpmenucart-main.min.css

251 ms

css

css

37 ms

fontello.css

fontello.css

253 ms

style.css

style.css

251 ms

core.animation.css

core.animation.css

316 ms

theme.shortcodes.css

theme.shortcodes.css

332 ms

theme.css

theme.css

405 ms

responsive.css

responsive.css

337 ms

mediaelementplayer-legacy.min.css

mediaelementplayer-legacy.min.css

340 ms

wp-mediaelement.min.css

wp-mediaelement.min.css

336 ms

js_composer.min.css

js_composer.min.css

556 ms

jquery.min.js

jquery.min.js

416 ms

jquery-migrate.min.js

jquery-migrate.min.js

417 ms

jquery.blockUI.min.js

jquery.blockUI.min.js

417 ms

add-to-cart.min.js

add-to-cart.min.js

415 ms

js.cookie.min.js

js.cookie.min.js

482 ms

woocommerce.min.js

woocommerce.min.js

495 ms

wpmenucart-ajax-assist.min.js

wpmenucart-ajax-assist.min.js

495 ms

woocommerce-add-to-cart.js

woocommerce-add-to-cart.js

494 ms

modernizr.min.js

modernizr.min.js

495 ms

tracking.js

tracking.js

569 ms

gtagv4.js

gtagv4.js

665 ms

slim-10_7.css

slim-10_7.css

19 ms

wc-blocks.css

wc-blocks.css

590 ms

core.messages.css

core.messages.css

591 ms

magnific-popup.css

magnific-popup.css

591 ms

sourcebuster.min.js

sourcebuster.min.js

630 ms

order-attribution.min.js

order-attribution.min.js

635 ms

mailchimp-woocommerce-public.min.js

mailchimp-woocommerce-public.min.js

668 ms

superfish.js

superfish.js

671 ms

core.utils.js

core.utils.js

671 ms

core.init.js

core.init.js

710 ms

theme.init.js

theme.init.js

711 ms

mediaelement-and-player.min.js

mediaelement-and-player.min.js

678 ms

mediaelement-migrate.min.js

mediaelement-migrate.min.js

593 ms

wp-mediaelement.min.js

wp-mediaelement.min.js

519 ms

social-share.js

social-share.js

509 ms

theme.shortcodes.js

theme.shortcodes.js

549 ms

style.css

style.css

633 ms

stylesheet.css

stylesheet.css

580 ms

stylesheet.css

stylesheet.css

581 ms

core.messages.js

core.messages.js

519 ms

js_composer_front.min.js

js_composer_front.min.js

502 ms

jquery.magnific-popup.min.js

jquery.magnific-popup.min.js

538 ms

pattern-banner-min.png

pattern-banner-min.png

92 ms

logo-letterbox-lab.png

logo-letterbox-lab.png

91 ms

science-subscription-box.jpg

science-subscription-box.jpg

292 ms

Explore-9.jpg

Explore-9.jpg

291 ms

Investigate-10.jpg

Investigate-10.jpg

292 ms

Squirmy-worms-min-e1560797839388.jpg

Squirmy-worms-min-e1560797839388.jpg

315 ms

CREST_AccreditedResource_Kitemark_AW_FullColour.png

CREST_AccreditedResource_Kitemark_AW_FullColour.png

254 ms

Fun.jpg

Fun.jpg

255 ms

Flexible.jpg

Flexible.jpg

291 ms

Convenient.jpg

Convenient.jpg

291 ms

Memorable.jpg

Memorable.jpg

335 ms

Educational.jpg

Educational.jpg

334 ms

Great-value.jpg

Great-value.jpg

336 ms

just-learn.jpg

just-learn.jpg

337 ms

Investigate-3.jpg

Investigate-3.jpg

335 ms

breathless_balloon-e1525249736156.png

breathless_balloon-e1525249736156.png

395 ms

glow-with-the-flow.png

glow-with-the-flow.png

415 ms

slippery-slime.png

slippery-slime.png

414 ms

fizz-rocket-e1525191808451.png

fizz-rocket-e1525191808451.png

417 ms

colourful_chemistry_with_dropper-1.png

colourful_chemistry_with_dropper-1.png

418 ms

Robo-Hand-e1525191967656.png

Robo-Hand-e1525191967656.png

419 ms

4girls3-1.jpg

4girls3-1.jpg

551 ms

4girls4.jpg

4girls4.jpg

492 ms

whats-in-the-box-min-e1560795593410.jpg

whats-in-the-box-min-e1560795593410.jpg

727 ms

1_Investigate_Box-1024x1024.jpg

1_Investigate_Box-1024x1024.jpg

495 ms

Explore-1.jpg

Explore-1.jpg

575 ms

guardian.png

guardian.png

502 ms

JDA-1.png

JDA-1.png

570 ms

Letterbox-Lab-Start-Up.jpg

Letterbox-Lab-Start-Up.jpg

573 ms

bbc-one.png

bbc-one.png

576 ms

school-run.png

school-run.png

629 ms

sbs.png

sbs.png

649 ms

top.png

top.png

650 ms

c78c796ee0dd71e14ccc806f9.js

c78c796ee0dd71e14ccc806f9.js

313 ms

4iCs6KVjbNBYlgoKfw7z.ttf

4iCs6KVjbNBYlgoKfw7z.ttf

30 ms

4iCv6KVjbNBYlgoC1CzjsGyI.ttf

4iCv6KVjbNBYlgoC1CzjsGyI.ttf

31 ms

4iCv6KVjbNBYlgoCxCvjsGyI.ttf

4iCv6KVjbNBYlgoCxCvjsGyI.ttf

164 ms

GrilledCheese.OTF

GrilledCheese.OTF

568 ms

Verveine.TTF

Verveine.TTF

649 ms

woocommerce-smallscreen.css

woocommerce-smallscreen.css

80 ms

Accessibility Review

letterboxlab.com accessibility score

84

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

Heading elements are not in a sequentially-descending order

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

Links do not have a discernible name

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

letterboxlab.com best practices score

92

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

General

Impact

Issue

Low

Detected JavaScript libraries

High

Page has valid source maps

SEO Factors

letterboxlab.com SEO score

86

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

Links do not have descriptive text

Crawling and Indexing

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

Impact

Issue

High

Links are not crawlable

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

Language and Encoding

  • Language Detected

    EN

  • Language Claimed

    EN

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Letterboxlab.com can be misinterpreted by Google and other search engines. Our service has detected that English is used on the page, and it matches the claimed language. Our system also found out that Letterboxlab.com 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

letterboxlab.com

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