Tools & Wizards About Us
blackstonedivecenter.com screenshot

Report Summary

  • 16

    Performance

    Renders faster than
    30% of other websites

  • 71

    Accessibility

    Visual factors better than
    that of 36% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    55% of websites

  • 77

    SEO

    Google-friendlier than
    36% of websites

blackstonedivecenter.com

Snorkeling and Diving on Tenerife - Blackstone Dive Center Tenerife

Page Load Speed

5.1 sec in total

First Response

264 ms

Resources Loaded

4.1 sec

Page Rendered

706 ms

blackstonedivecenter.com screenshot

About Website

Click here to check amazing Blackstone Dive Center content. Otherwise, check out these important facts you probably never knew about blackstonedivecenter.com

We offer diving on Tenerife all year round, all over the island. High-quality rental equipment and free transport! Check also our snorkeling offer!

Visit blackstonedivecenter.com

Key Findings

We analyzed Blackstonedivecenter.com page load time and found that the first response time was 264 ms and then it took 4.8 sec to load all DOM resources and completely render a web page. This is a poor result, as 70% of websites can load faster.

Performance Metrics

blackstonedivecenter.com performance score

16

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value7.0 s

1/100

10%

LCP (Largest Contentful Paint)

Value22.0 s

0/100

25%

SI (Speed Index)

Value18.3 s

0/100

10%

TBT (Total Blocking Time)

Value2,200 ms

6/100

30%

CLS (Cumulative Layout Shift)

Value0.072

96/100

15%

TTI (Time to Interactive)

Value21.5 s

1/100

10%

Network Requests Diagram

blackstonedivecenter.com

264 ms

www.blackstonedivecenter.com

518 ms

27r2j.css

182 ms

27r2j.css

305 ms

27r2j.css

953 ms

Our browser made a total of 87 requests to load all elements on the main page. We found that 71% of them (62 requests) were addressed to the original Blackstonedivecenter.com, 16% (14 requests) were made to Fonts.gstatic.com and 6% (5 requests) were made to Youtube.com. The less responsive or slowest element that took the longest time to load (1.2 sec) belongs to the original domain Blackstonedivecenter.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 1.6 MB (24%)

Content Size

6.5 MB

After Optimization

4.9 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Blackstonedivecenter.com main page is 6.5 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. Only a small number of websites need less resources to load. Images take 4.7 MB which makes up the majority of the site volume.

HTML Optimization

-83%

Potential reduce by 131.8 kB

  • Original 157.9 kB
  • After minification 149.1 kB
  • After compression 26.1 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 131.8 kB or 83% of the original size.

Image Optimization

-19%

Potential reduce by 896.0 kB

  • Original 4.7 MB
  • After minification 3.8 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. Obviously, Blackstone Dive Center needs image optimization as it can save up to 896.0 kB or 19% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-15%

Potential reduce by 92.8 kB

  • Original 625.1 kB
  • After minification 625.1 kB
  • After compression 532.3 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 92.8 kB or 15% of the original size.

CSS Optimization

-42%

Potential reduce by 441.9 kB

  • Original 1.1 MB
  • After minification 1.0 MB
  • After compression 608.3 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. Blackstonedivecenter.com needs all CSS files to be minified and compressed as it can save up to 441.9 kB or 42% of the original size.

Requests Breakdown

Number of requests can be reduced by 31 (45%)

Requests Now

69

After Optimization

38

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 69 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Blackstone Dive Center. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 28 to 1 for JavaScripts and from 5 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

blackstonedivecenter.com

blackstonedivecenter.com

264 ms

www.blackstonedivecenter.com

www.blackstonedivecenter.com

518 ms

27r2j.css

27r2j.css

182 ms

27r2j.css

27r2j.css

305 ms

27r2j.css

27r2j.css

953 ms

27r2j.js

27r2j.js

812 ms

27r2j.css

27r2j.css

444 ms

f12-cf7-captcha-cf7.js

f12-cf7-captcha-cf7.js

315 ms

hooks.min.js

hooks.min.js

364 ms

i18n.min.js

i18n.min.js

386 ms

index.js

index.js

416 ms

index.js

index.js

465 ms

front.min.js

front.min.js

489 ms

swiped-events.min.js

swiped-events.min.js

509 ms

imagesloaded.min.js

imagesloaded.min.js

556 ms

effect.min.js

effect.min.js

567 ms

ditty-news-ticker.js

ditty-news-ticker.js

606 ms

swiper.jquery.js

swiper.jquery.js

671 ms

jquery.magnific-popup.min.js

jquery.magnific-popup.min.js

669 ms

trx_addons.js

trx_addons.js

752 ms

__scripts.js

__scripts.js

768 ms

mediaelement-and-player.min.js

mediaelement-and-player.min.js

847 ms

mediaelement-migrate.min.js

mediaelement-migrate.min.js

769 ms

wp-mediaelement.min.js

wp-mediaelement.min.js

826 ms

js_composer_front.min.js

js_composer_front.min.js

864 ms

vc-waypoints.min.js

vc-waypoints.min.js

1047 ms

skrollr.min.js

skrollr.min.js

1046 ms

jquery.flexslider-min.js

jquery.flexslider-min.js

1048 ms

init.min.js

init.min.js

1047 ms

Blackstone-Dive-Center-logo-300px.png

Blackstone-Dive-Center-logo-300px.png

194 ms

dummy.png

dummy.png

129 ms

Tenerife-diving-small-map.png

Tenerife-diving-small-map.png

133 ms

Presentation-Dive-Center-300x300.jpg

Presentation-Dive-Center-300x300.jpg

130 ms

Kerstin-002.jpg

Kerstin-002.jpg

132 ms

SSI-franz.-deu.-span.-engl..jpg

SSI-franz.-deu.-span.-engl..jpg

704 ms

Carlos-2024.jpg

Carlos-2024.jpg

312 ms

SSI-span.-engl..jpg

SSI-span.-engl..jpg

314 ms

Tobias-2024.jpg

Tobias-2024.jpg

313 ms

SSI-deu.-engl..jpg

SSI-deu.-engl..jpg

704 ms

image5.jpeg

image5.jpeg

705 ms

image0.jpeg

image0.jpeg

757 ms

image2.jpeg

image2.jpeg

704 ms

image7.jpeg

image7.jpeg

702 ms

image3.jpeg

image3.jpeg

756 ms

image1.jpeg

image1.jpeg

758 ms

BDC-logo-170x160v3.png

BDC-logo-170x160v3.png

756 ms

DSD-main.jpg

DSD-main.jpg

756 ms

cert.divers-main.jpg

cert.divers-main.jpg

754 ms

Become350.jpg

Become350.jpg

829 ms

Mares-360.png

Mares-360.png

828 ms

Horizontal-Black.png

Horizontal-Black.png

1015 ms

Professional-Black.png

Professional-Black.png

1019 ms

AquaLung.png

AquaLung.png

843 ms

Apeks.png

Apeks.png

828 ms

logo_xs.png

logo_xs.png

1008 ms

Mares-360-300x134.png

Mares-360-300x134.png

1007 ms

tecline.png

tecline.png

1007 ms

suunto.png

suunto.png

1007 ms

Tripadvisor_Recommended.jpg

Tripadvisor_Recommended.jpg

1170 ms

sa_C82FcKaQ

sa_C82FcKaQ

160 ms

Footer_BG.jpg

Footer_BG.jpg

1124 ms

DewXAiKGIjI2Nf5AbGnRwMHAzJBRsZWJ02MTAyaIEYm7mYGDkgLD4GMIvNaRfTAaA0J5DN7rSLwQHCZmZw2ajC2BEYscGhI2Ijc4rLRjUQbxdHAwMji0NHckgESEkkEGzmYWLk0drB+L91A0vvRiYGFwAMdiP0AAA=

DewXAiKGIjI2Nf5AbGnRwMHAzJBRsZWJ02MTAyaIEYm7mYGDkgLD4GMIvNaRfTAaA0J5DN7rSLwQHCZmZw2ajC2BEYscGhI2Ijc4rLRjUQbxdHAwMji0NHckgESEkkEGzmYWLk0drB+L91A0vvRiYGFwAMdiP0AAA=

62 ms

fontello.svg

fontello.svg

1110 ms

dQNL70YmBhcADHYj9AAA

dQNL70YmBhcADHYj9AAA

61 ms

trx_addons_icons.svg

trx_addons_icons.svg

1107 ms

www-player.css

www-player.css

55 ms

www-embed-player.js

www-embed-player.js

118 ms

base.js

base.js

179 ms

ad_status.js

ad_status.js

227 ms

rdCp1AReygrM8vCU9pxTL-j0g8CnLVJfLwplrwgoyV4.js

rdCp1AReygrM8vCU9pxTL-j0g8CnLVJfLwplrwgoyV4.js

201 ms

embed.js

embed.js

78 ms

KFOmCnqEu92Fr1Mu4mxMKTU1Kg.woff

KFOmCnqEu92Fr1Mu4mxMKTU1Kg.woff

224 ms

KFOmCnqEu92Fr1Mu7GxMKTU1Kvnz.woff

KFOmCnqEu92Fr1Mu7GxMKTU1Kvnz.woff

225 ms

KFOmCnqEu92Fr1Mu7WxMKTU1Kvnz.woff

KFOmCnqEu92Fr1Mu7WxMKTU1Kvnz.woff

241 ms

KFOmCnqEu92Fr1Mu4WxMKTU1Kvnz.woff

KFOmCnqEu92Fr1Mu4WxMKTU1Kvnz.woff

248 ms

KFOmCnqEu92Fr1Mu7mxMKTU1Kvnz.woff

KFOmCnqEu92Fr1Mu7mxMKTU1Kvnz.woff

250 ms

KFOmCnqEu92Fr1Mu5mxMKTU1Kvnz.woff

KFOmCnqEu92Fr1Mu5mxMKTU1Kvnz.woff

253 ms

KFOmCnqEu92Fr1Mu72xMKTU1Kvnz.woff

KFOmCnqEu92Fr1Mu72xMKTU1Kvnz.woff

252 ms

KFOlCnqEu92Fr1MmEU9fBBc-AMP6lQ.woff

KFOlCnqEu92Fr1MmEU9fBBc-AMP6lQ.woff

249 ms

KFOlCnqEu92Fr1MmEU9fChc-AMP6lbBP.woff

KFOlCnqEu92Fr1MmEU9fChc-AMP6lbBP.woff

253 ms

KFOlCnqEu92Fr1MmEU9fCxc-AMP6lbBP.woff

KFOlCnqEu92Fr1MmEU9fCxc-AMP6lbBP.woff

255 ms

KFOlCnqEu92Fr1MmEU9fBxc-AMP6lbBP.woff

KFOlCnqEu92Fr1MmEU9fBxc-AMP6lbBP.woff

256 ms

KFOlCnqEu92Fr1MmEU9fCBc-AMP6lbBP.woff

KFOlCnqEu92Fr1MmEU9fCBc-AMP6lbBP.woff

256 ms

KFOlCnqEu92Fr1MmEU9fABc-AMP6lbBP.woff

KFOlCnqEu92Fr1MmEU9fABc-AMP6lbBP.woff

256 ms

KFOlCnqEu92Fr1MmEU9fCRc-AMP6lbBP.woff

KFOlCnqEu92Fr1MmEU9fCRc-AMP6lbBP.woff

257 ms

id

id

53 ms

Create

Create

186 ms

Accessibility Review

blackstonedivecenter.com accessibility score

71

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

Image elements do not have [alt] attributes

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

blackstonedivecenter.com best practices score

83

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

Page has valid source maps

SEO Factors

blackstonedivecenter.com SEO score

77

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

High

Image elements do not have [alt] attributes

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

    EN

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Blackstonedivecenter.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 Blackstonedivecenter.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

blackstonedivecenter.com

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