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Top Technologies

Nginx

Web Servers

PHP

Programming Languages

Google Tag Manager

Tag Managers

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Font Scripts

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Web Frameworks

42 b-ok.cc Last Updated: 2 years

Success 70% of passed verification steps

Warning 7% of total warning

Errors 23% of total errors, require fast action

Mobile

Performance Desktop Score 95%

Best Practices Desktop Score 92%

SEO Desktop Score 80%

Progressive Web App Desktop Score 65%

Performance Mobile Score 68%

Best Practices Mobile Score 92%

SEO Mobile Score 82%

Progressive Web App Mobile Score 67%

Page Authority Authority 41%

Domain Authority Domain Authority 39%

Moz Rank 4.1/10

Bounce Rate Rate 0%

Charset Encoding

Great, language/character encoding is specified: UTF-8

Title Tag 54 Characters

ELECTRONIC LIBRARY. DOWNLOAD BOOKS FREE. FINDING BOOKS

Meta Description 98 Characters

Electronic library. Download books free. Finding books | B–OK. Download books for free. Find books

Effective URL 15 Characters

https://b-ok.cc

Excerpt Page content

Electronic library. Download books free. Finding books ...

Keywords Cloud Density

books12 library12 free5 search5 download4 book4 electronic4 more4 without3 epub3

Keyword Consistency Keyword density is one of the main terms in SEO

Keyword	Freq	Title	Desc	Domain	H1	H2
books	12
library	12
free	5
search	5
download	4
book	4
electronic	4
more	4
without	3
epub	3

Google Preview Your look like this in google search result

ELECTRONIC LIBRARY. DOWNLOAD BOOKS FREE. FINDING BOOKS

https://b-ok.cc

Electronic library. Download books free. Finding books | B–OK. Download books for free. Find books

Robots.txt File Detected

http://b-ok.cc/robots.txt

Sitemap.xml File No Found

http://b-ok.cc/sitemap.xml

Whois Is a query and response protocol that is widely used for querying databases that store the registered users or assignees of an Internet resource, such as a domain name, an IP address block, or an autonomous system

Updated: 2019-08-23 / 2 years

Create on: 2018-10-08 / 3 years

Expires on: 2020-10-08 / 9 months 23 days

Eranet International Limited ,

Registrar Whois Server: whois.eranet.com

Registrar URL: http://www.eranet.com

Nameservers

NS1.Z-LIB.ORG

NS2.Z-LIB.ORG

Page Size Code & Text Ratio

Document Size: ~33.04 KB

Code Size: ~23 KB

Text Size: ~10.04 KB Ratio: 30.39%

Estimation Traffic and Earnings

Only Registered Users

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Technologies

PWA - Manifest

Y-Library

The web app manifest is a simple JSON file that gives you, the developer, the ability to control how your app appears to the user in areas where they would expect to see apps (for example, a mobile device's home screen)

Param name

Y-Library

Param theme_color

#ffffff

Param background_color

#ffffff

Param display

standalone

Manifest is not valid

Your manifest are missing some important params, read more in Web App Manifest

Desktop

Total Blocking Time 0 ms

Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds.

JavaScript execution time 0.6 s

Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this

Server Backend Latencies 0 ms

Server latencies can impact web performance. If the server latency of an origin is high, it's an indication the server is overloaded or has poor backend performance

Properly size images Potential savings of 568 KB

Serve images that are appropriately-sized to save cellular data and improve load time

Speed Index 1.6 s

Speed Index shows how quickly the contents of a page are visibly populated

First CPU Idle 0.7 s

First CPU Idle marks the first time at which the page's main thread is quiet enough to handle input. [Learn more](https://web.dev/first-cpu-idle).

Avoids enormous network payloads Total size was 1,340 KB

Large network payloads cost users real money and are highly correlated with long load times

Minimizes main-thread work 1.1 s

Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this

First Contentful Paint 0.5 s

First Contentful Paint marks the time at which the first text or image is painted

Includes front-end JavaScript libraries with known security vulnerabilities 7 vulnerabilities detected

Some third-party scripts may contain known security vulnerabilities that are easily identified and exploited by attackers

Avoid chaining critical requests 5 chains found

The Critical Request Chains below show you what resources are loaded with a high priority. Consider reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load

Avoids an excessive DOM size 508 elements

A large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow)

Minify JavaScript Potential savings of 6 KB

Minifying JavaScript files can reduce payload sizes and script parse time

First Meaningful Paint 0.7 s

First Meaningful Paint measures when the primary content of a page is visible

Keep request counts low and transfer sizes small 36 requests • 1,340 KB

To set budgets for the quantity and size of page resources, add a budget.json file

Serve static assets with an efficient cache policy 27 resources found

A long cache lifetime can speed up repeat visits to your page

Max Potential First Input Delay 40 ms

The maximum potential First Input Delay that your users could experience is the duration, in milliseconds, of the longest task

Time to Interactive 0.7 s

Time to interactive is the amount of time it takes for the page to become fully interactive

Network Round Trip Times 0 ms

Network round trip times (RTT) have a large impact on performance. If the RTT to an origin is high, it's an indication that servers closer to the user could improve performance

Estimated Input Latency 10 ms

Estimated Input Latency is an estimate of how long your app takes to respond to user input, in milliseconds, during the busiest 5s window of page load. If your latency is higher than 50 ms, users may perceive your app as laggy

Remove unused CSS Potential savings of 73 KB

Remove dead rules from stylesheets and defer the loading of CSS not used for above-the-fold content to reduce unnecessary bytes consumed by network activity

Serve images in next-gen formats Potential savings of 236 KB

Image formats like JPEG 2000, JPEG XR, and WebP often provide better compression than PNG or JPEG, which means faster downloads and less data consumption

Server response times are low (TTFB) Root document took 530 ms

Time To First Byte identifies the time at which your server sends a response

Eliminate render-blocking resources Potential savings of 240 ms

Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles

Efficiently encode images Potential savings of 16 KB

Optimized images load faster and consume less cellular data

Minimize third-party usage Third-party code blocked the main thread for 0 ms

Third-party code can significantly impact load performance. Limit the number of redundant third-party providers and try to load third-party code after your page has primarily finished loading

Mobile

Estimated Input Latency 40 ms

First Contentful Paint (3G) 3209 ms

First Contentful Paint 3G marks the time at which the first text or image is painted while on a 3G network

Tap targets are not sized appropriately 91% appropriately sized tap targets

Interactive elements like buttons and links should be large enough (48x48px), and have enough space around them, to be easy enough to tap without overlapping onto other elements

Document uses legible font sizes 64.23% legible text

Font sizes less than 12px are too small to be legible and require mobile visitors to “pinch to zoom” in order to read. Strive to have >60% of page text ≥12px

Remove unused CSS Potential savings of 73 KB

Remove dead rules from stylesheets and defer the loading of CSS not used for above-the-fold content to reduce unnecessary bytes consumed by network activity

Serve images in next-gen formats Potential savings of 236 KB

Image formats like JPEG 2000, JPEG XR, and WebP often provide better compression than PNG or JPEG, which means faster downloads and less data consumption

Server response times are low (TTFB) Root document took 130 ms

Time To First Byte identifies the time at which your server sends a response

Eliminate render-blocking resources Potential savings of 720 ms

Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles

Efficiently encode images Potential savings of 16 KB

Optimized images load faster and consume less cellular data

Minimize third-party usage Third-party code blocked the main thread for 220 ms

Third-party code can significantly impact load performance. Limit the number of redundant third-party providers and try to load third-party code after your page has primarily finished loading

Total Blocking Time 490 ms

Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds.

Reduce JavaScript execution time 2.3 s

Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this

Server Backend Latencies 0 ms

Server latencies can impact web performance. If the server latency of an origin is high, it's an indication the server is overloaded or has poor backend performance

Defer offscreen images Potential savings of 157 KB

Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive

Properly size images Potential savings of 583 KB

Serve images that are appropriately-sized to save cellular data and improve load time

Speed Index 3.9 s

Speed Index shows how quickly the contents of a page are visibly populated

First CPU Idle 6.2 s

First CPU Idle marks the first time at which the page's main thread is quiet enough to handle input. [Learn more](https://web.dev/first-cpu-idle).

Avoids enormous network payloads Total size was 1,322 KB

Large network payloads cost users real money and are highly correlated with long load times

Minimize main-thread work 3.9 s

Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this

First Contentful Paint 1.6 s

First Contentful Paint marks the time at which the first text or image is painted

Includes front-end JavaScript libraries with known security vulnerabilities 7 vulnerabilities detected

Some third-party scripts may contain known security vulnerabilities that are easily identified and exploited by attackers

Avoid chaining critical requests 4 chains found

Avoids an excessive DOM size 508 elements

Minify JavaScript Potential savings of 6 KB

Minifying JavaScript files can reduce payload sizes and script parse time

First Meaningful Paint 2.5 s

First Meaningful Paint measures when the primary content of a page is visible

Keep request counts low and transfer sizes small 35 requests • 1,322 KB

To set budgets for the quantity and size of page resources, add a budget.json file

Serve static assets with an efficient cache policy 26 resources found

A long cache lifetime can speed up repeat visits to your page

Max Potential First Input Delay 180 ms

The maximum potential First Input Delay that your users could experience is the duration, in milliseconds, of the longest task

Time to Interactive 8.2 s

Time to interactive is the amount of time it takes for the page to become fully interactive

Network Round Trip Times 0 ms

Network round trip times (RTT) have a large impact on performance. If the RTT to an origin is high, it's an indication that servers closer to the user could improve performance

Speed And Optimization Tips

Only Registered Users

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Alexa Rank

0

Local Rank: / Users: / PageViews:

Global Rank

Information Server

Response Header HTTP headers carry information about the client browser, the requested page and the server

HTTP/1.1 200 OK
Server: nginx
Date: Wed, 27 Nov 2019 06:22:59 GMT
Content-Type: text/html; charset=UTF-8
Connection: keep-alive
Content-Encoding: gzip

DNS Records DNS Resource Records associated with a hostname

View DNS Records

Type	Name	Value	Class	TTL
A	b-ok.cc	81.17.17.254	IN	3555
A	b-ok.cc	5.182.211.50	IN	3555
NS	b-ok.cc	ns2.z-lib.org	IN	3599
NS	b-ok.cc	ns1.z-lib.org	IN	3599

Your Website Score is

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42 b-ok.cc Last Updated: 2 years

Desktop

Mobile

Estimation Traffic and Earnings

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Technologies

jQuery

Liveinternet

Nginx

Twitter Bootstrap

PWA - Manifest

Desktop

Mobile

Speed And Optimization Tips

Sign up for see all features and reviews about this site

Alexa Rank

0

Information Server

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