Tools & Wizards About Us

Report Summary

  • 42

    Performance

    Renders faster than
    61% of other websites

  • 96

    Accessibility

    Visual factors better than
    that of 89% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 83

    SEO

    Google-friendlier than
    46% of websites

butterflies.si.edu

Butterfly Pavilion | Smithsonian National Museum of Natural History

Page Load Speed

721 ms in total

First Response

62 ms

Resources Loaded

436 ms

Page Rendered

223 ms

About Website

Visit butterflies.si.edu now to see the best up-to-date Butterflies Si content for United States and also check out these interesting facts you probably never knew about butterflies.si.edu

Walk through our butterfly pavilion filled with tropical plants and live, flittering butterflies. A great place to see butterflies in Washington, D.C.

Visit butterflies.si.edu

Key Findings

We analyzed Butterflies.si.edu page load time and found that the first response time was 62 ms and then it took 659 ms to load all DOM resources and completely render a web page. This is quite a good result, as only 10% of websites can load faster.

Performance Metrics

butterflies.si.edu performance score

42

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value2.6 s

64/100

10%

LCP (Largest Contentful Paint)

Value4.7 s

33/100

25%

SI (Speed Index)

Value6.4 s

40/100

10%

TBT (Total Blocking Time)

Value610 ms

49/100

30%

CLS (Cumulative Layout Shift)

Value0.222

56/100

15%

TTI (Time to Interactive)

Value15.3 s

7/100

10%

Network Requests Diagram

butterflies.si.edu

62 ms

swfobject.js

51 ms

highslide-full.js

40 ms

highslide.config.js

35 ms

highslide.css

36 ms

Our browser made a total of 57 requests to load all elements on the main page. We found that 60% of them (34 requests) were addressed to the original Butterflies.si.edu, 11% (6 requests) were made to Naturalhistory.si.edu and 7% (4 requests) were made to Translate.googleapis.com. The less responsive or slowest element that took the longest time to load (187 ms) relates to the external source Cdnapisec.kaltura.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 616.2 kB (63%)

Content Size

982.8 kB

After Optimization

366.6 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Butterflies.si.edu main page is 982.8 kB. This result falls beyond the top 1M of websites and identifies a large and not optimized web page that may take ages to load. 50% of websites need less resources to load. Javascripts take 774.5 kB which makes up the majority of the site volume.

HTML Optimization

-77%

Potential reduce by 29.7 kB

  • Original 38.4 kB
  • After minification 32.2 kB
  • After compression 8.7 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 6.2 kB, which is 16% 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 29.7 kB or 77% of the original size.

Image Optimization

-15%

Potential reduce by 14.7 kB

  • Original 99.3 kB
  • After minification 84.6 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, Butterflies Si needs image optimization as it can save up to 14.7 kB or 15% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-67%

Potential reduce by 516.3 kB

  • Original 774.5 kB
  • After minification 647.2 kB
  • After compression 258.2 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. It is highly recommended that all JavaScript files should be compressed and minified as it can save up to 516.3 kB or 67% of the original size.

CSS Optimization

-79%

Potential reduce by 55.6 kB

  • Original 70.6 kB
  • After minification 48.2 kB
  • After compression 15.0 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. Butterflies.si.edu needs all CSS files to be minified and compressed as it can save up to 55.6 kB or 79% of the original size.

Requests Breakdown

Number of requests can be reduced by 44 (80%)

Requests Now

55

After Optimization

11

  • Images
  • JavaScript
  • CSS

The browser has sent 55 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Butterflies Si. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 23 to 1 for JavaScripts and from 13 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

Accessibility Review

butterflies.si.edu accessibility score

96

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

Best Practices

butterflies.si.edu 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

Low

Detected JavaScript libraries

High

Uses deprecated APIs

High

Browser errors were logged to the console

SEO Factors

butterflies.si.edu SEO score

83

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

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 Butterflies.si.edu 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 Butterflies.si.edu 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

Open Graph description is not detected on the main page of Butterflies Si. 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: