Tools & Wizards About Us
callback.com screenshot

Report Summary

  • 44

    Performance

    Renders faster than
    63% of other websites

  • 76

    Accessibility

    Visual factors better than
    that of 42% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    35% of websites

  • 68

    SEO

    Google-friendlier than
    28% of websites

callback.com

Callback Technologies | System-level components for data storage and access control | Callback Technologies

Page Load Speed

1.1 sec in total

First Response

28 ms

Resources Loaded

548 ms

Page Rendered

499 ms

callback.com screenshot

About Website

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

Callback Technologies delivers cutting-edge technology that simplifies the development and implementation of virtual filesystems and operating system request interception. Our products enable the crea...

Visit callback.com

Key Findings

We analyzed Callback.com page load time and found that the first response time was 28 ms and then it took 1 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 20% of websites can load faster.

Performance Metrics

callback.com performance score

44

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value2.9 s

53/100

10%

LCP (Largest Contentful Paint)

Value6.4 s

10/100

25%

SI (Speed Index)

Value2.9 s

95/100

10%

TBT (Total Blocking Time)

Value540 ms

54/100

30%

CLS (Cumulative Layout Shift)

Value0.283

43/100

15%

TTI (Time to Interactive)

Value8.4 s

39/100

10%

Network Requests Diagram

www.callback.com

28 ms

bundle.css

14 ms

js

179 ms

bundle.js

92 ms

icon-cbfsconnect.svg

27 ms

Our browser made a total of 53 requests to load all elements on the main page. We found that 87% of them (46 requests) were addressed to the original Callback.com, 4% (2 requests) were made to Googletagmanager.com and 4% (2 requests) were made to Google-analytics.com. The less responsive or slowest element that took the longest time to load (230 ms) belongs to the original domain Callback.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 162.3 kB (34%)

Content Size

477.4 kB

After Optimization

315.1 kB

  • HTML
  • Images
  • JavaScript

In fact, the total size of Callback.com main page is 477.4 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. Images take 296.1 kB which makes up the majority of the site volume.

HTML Optimization

-80%

Potential reduce by 42.5 kB

  • Original 53.2 kB
  • After minification 40.9 kB
  • After compression 10.6 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 12.2 kB, which is 23% 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 42.5 kB or 80% of the original size.

Image Optimization

-24%

Potential reduce by 70.1 kB

  • Original 296.1 kB
  • After minification 226.0 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, Callback needs image optimization as it can save up to 70.1 kB or 24% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-39%

Potential reduce by 49.7 kB

  • Original 128.1 kB
  • After minification 128.1 kB
  • After compression 78.4 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 49.7 kB or 39% of the original size.

Requests Breakdown

Number of requests can be reduced by 12 (24%)

Requests Now

51

After Optimization

39

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 51 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Callback. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 6 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

www.callback.com

www.callback.com

28 ms

bundle.css

bundle.css

14 ms

js

js

179 ms

bundle.js

bundle.js

92 ms

icon-cbfsconnect.svg

icon-cbfsconnect.svg

27 ms

icon-cbfsfilter.svg

icon-cbfsfilter.svg

112 ms

icon-cbfsvault.svg

icon-cbfsvault.svg

112 ms

icon-cbfssync.svg

icon-cbfssync.svg

111 ms

icon-cbfsshell.svg

icon-cbfsshell.svg

151 ms

logo.svg

logo.svg

148 ms

home-cbfsconnect.svg

home-cbfsconnect.svg

152 ms

home-cbfsfilter.svg

home-cbfsfilter.svg

145 ms

home-cbfsvault.svg

home-cbfsvault.svg

146 ms

home-cbfssync.svg

home-cbfssync.svg

143 ms

Absolute_logo.svg

Absolute_logo.svg

151 ms

Adobe-og.svg

Adobe-og.svg

153 ms

Amazon-og.svg

Amazon-og.svg

154 ms

Blackberry_logo.svg

Blackberry_logo.svg

156 ms

CenturyLink_2010_logo.svg

CenturyLink_2010_logo.svg

155 ms

Citrix.svg

Citrix.svg

158 ms

cloudberry2.png

cloudberry2.png

160 ms

Datto_logo.svg

Datto_logo.svg

159 ms

egnyte-lightbg-vector.svg

egnyte-lightbg-vector.svg

161 ms

france_telecom.svg

france_telecom.svg

214 ms

Gen-dyn.svg

Gen-dyn.svg

217 ms

hitachi_logo-og.svg

hitachi_logo-og.svg

214 ms

HP_New_Logo_2D.svg

HP_New_Logo_2D.svg

221 ms

Intel-og.svg

Intel-og.svg

217 ms

J2_Global_Logo.png

J2_Global_Logo.png

223 ms

Lenovo.svg

Lenovo.svg

218 ms

LG_logo.svg

LG_logo.svg

220 ms

Panasonic_logo.svg

Panasonic_logo.svg

222 ms

Philips_logo_new.svg

Philips_logo_new.svg

224 ms

rackspace.png

rackspace.png

228 ms

seagate_logo.svg

seagate_logo.svg

225 ms

ubi_logo.png

ubi_logo.png

224 ms

Thales.svg

Thales.svg

226 ms

Trend-Micro-og.svg

Trend-Micro-og.svg

227 ms

ai.2.min.js

ai.2.min.js

142 ms

shattered.png

shattered.png

230 ms

icon-cbfsconnect.svg

icon-cbfsconnect.svg

205 ms

icon-cbfsfilter.svg

icon-cbfsfilter.svg

187 ms

Eldos-Icons.ttf

Eldos-Icons.ttf

130 ms

icon-cbfsvault.svg

icon-cbfsvault.svg

123 ms

icon-cbfssync.svg

icon-cbfssync.svg

124 ms

icon-cbfsshell.svg

icon-cbfsshell.svg

92 ms

icon-cbfsdisk.svg

icon-cbfsdisk.svg

91 ms

icon-cbfsstorage.svg

icon-cbfsstorage.svg

91 ms

js

js

134 ms

151 ms

analytics.js

analytics.js

5 ms

33 ms

collect

collect

12 ms

Accessibility Review

callback.com accessibility score

76

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.

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

Links do not have a discernible name

Best Practices

callback.com best practices score

75

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

General

Impact

Issue

Low

Detected JavaScript libraries

High

Page has valid source maps

High

Issues were logged in the Issues panel in Chrome Devtools

SEO Factors

callback.com SEO score

68

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

    N/A

  • Encoding

    UTF-8

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

callback.com

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