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Top Technologies

Nginx
Web Servers
PHP
Programming Languages
Google Tag Manager
Tag Managers
Google Font API
Font Scripts
CloudFlare
CDN
jQuery
JavaScript Frameworks
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42 b-ok.cc Last Updated: 1 year

Success 70% of passed verification steps
Warning 7% of total warning
Errors 23% of total errors, require fast action
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Desktop

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---. FINDING BOOKS
Meta Description 98 Characters
Electronic library. Download books---. Finding books | B–OK. Download books for---. Find books
Effective URL 15 Characters
https://b-ok.cc
Excerpt Page content
Electronic library. Download books---. 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---. FINDING BOOKS
https://b-ok.cc
Electronic library. Download books---. Finding books | B–OK. Download books for---. 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 / 1 year
Create on: 2018-10-08 / 2 years
Expires on: 2020-10-08 / 3 months 10 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

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Technologies

PWA - Manifest

Y-Library 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

Desktop Screenshot
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

Mobile Screenshot
Estimated Input Latency 40 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
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
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 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

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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

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