Access nlb.by. Национальная библиотека Беларуси

name

value

score

weighting

FCP (First Contentful Paint)

Value3.5 s

35/100

10%

LCP (Largest Contentful Paint)

Value26.0 s

0/100

25%

SI (Speed Index)

Value18.3 s

0/100

10%

TBT (Total Blocking Time)

Value2,360 ms

5/100

30%

CLS (Cumulative Layout Shift)

Value0.198

62/100

15%

TTI (Time to Interactive)

Value25.7 s

0/100

10%

nlb.by

507 ms

nlb.by

2356 ms

kernel_main.css

263 ms

template_6d8e1419ae0ae075a79df8df003e1b06.css

601 ms

popup.min.css

375 ms

Our browser made a total of 118 requests to load all elements on the main page. We found that 83% of them (98 requests) were addressed to the original Nlb.by, 4% (5 requests) were made to Fonts.gstatic.com and 2% (2 requests) were made to Megavenue.by. The less responsive or slowest element that took the longest time to load (2.4 sec) belongs to the original domain Nlb.by.

Content Size

9.2 MB

After Optimization

8.8 MB

In fact, the total size of Nlb.by main page is 9.2 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. 70% of websites need less resources to load. Images take 8.1 MB which makes up the majority of the site volume.

HTML Optimization

-81%

Potential reduce by 211.1 kB

Original 259.1 kB
After minification 213.1 kB
After compression 48.0 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 45.9 kB, which is 18% 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 211.1 kB or 81% of the original size.

Image Optimization

-1%

Potential reduce by 102.9 kB

Original 8.1 MB
After minification 8.0 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. Nlb images are well optimized though.

JavaScript Optimization

-9%

Potential reduce by 73.6 kB

Original 856.6 kB
After minification 855.8 kB
After compression 783.0 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. This website has mostly compressed JavaScripts.

CSS Optimization

-12%

Potential reduce by 8.7 kB

Original 71.6 kB
After minification 71.6 kB
After compression 62.9 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. Nlb.by needs all CSS files to be minified and compressed as it can save up to 8.7 kB or 12% of the original size.

Requests Now

111

After Optimization

The browser has sent 111 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Nlb. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 20 to 1 for JavaScripts and from 4 to 1 for CSS and as a result speed up the page load time.

Accessibility Issues

These are opportunities to improve the legibility of your content.

High

Background and foreground colors do not have a sufficient contrast ratio.

These are opportunities to improve keyboard navigation in your application.

High

[id] attributes on active, focusable elements are not unique

These are opportunities to improve the interpretation of your content by users in different locales.

High

<html> element does not have a [lang] attribute

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.

High

Image elements do not have [alt] attributes

High

Links do not have a discernible name

High

Areas of Improvement

High

Does not use HTTPS

High

Includes front-end JavaScript libraries with known security vulnerabilities

Low

Ensure CSP is effective against XSS attacks

High

Displays images with incorrect aspect ratio

High

Serves images with low resolution

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

Search Engine Optimization Advices

To appear in search results, crawlers need access to your app.

High

Links are not crawlable

Format your HTML in a way that enables crawlers to better understand your app’s content.

High

Image elements do not have [alt] attributes

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/).

High

Document uses legible font sizes

High

Tap targets are not sized appropriately

Language and Encoding

Language Detected

ID
Language Claimed

N/A
Encoding

UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Nlb.by can be misinterpreted by Google and other search engines. Our service has detected that 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 Nlb.by 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

nlb.by

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

Report Summary

Performance

Accessibility

Best Practices

SEO

Национальная библиотека Беларуси

Page Load Speed

First Response

Resources Loaded

Page Rendered

About Website

Key Findings

Performance Metrics

Measured Metrics

FCP (First Contentful Paint)

LCP (Largest Contentful Paint)

SI (Speed Index)

TBT (Total Blocking Time)

CLS (Cumulative Layout Shift)

TTI (Time to Interactive)

Network Requests Diagram

nlb.by

nlb.by

kernel_main.css

template_6d8e1419ae0ae075a79df8df003e1b06.css

popup.min.css

Page Optimization Overview & Recommendations

Content Size

After Optimization

HTML Optimization

Image Optimization

JavaScript Optimization

CSS Optimization

Requests Breakdown

Requests Now

After Optimization

Network Requests Diagram

nlb.by

nlb.by

kernel_main.css

template_6d8e1419ae0ae075a79df8df003e1b06.css

popup.min.css

css

kernel_main.js

core_db.min.js

core_frame_cache.min.js

html5shiv.min.js

jquery.min.js

jquery.tmpl.min.js

jquery.form.js

jquery.scrollTo.min.js

TweenMax.min.js

isotope.pkgd.min.js

widget.js

template_0d447ce194000c43c6c24ef525820e15.js

TnYiZsuEsx

js

img-14.jpg

gerb_big.jpg

flag_big.jpg

2024znakkachestva.jpg

dompressy.png

elib.nlb.by.jpg

pamiaci_viechny_ahon_sl.jpg

af_novinki.jpg

slava_pieramozcam_sl.jpg

mova_vajennaj_iliustracyi_sl.jpg

zyvyja_kamiani_antarktydy_sl.jpg

sl_zamchuzyny_uschodu.jpg

shliach_milasernasci_sl.jpg

sl_sny_ab_bielarusi.jpg

gogol_sl.jpg

mora_2.jpg

bis_nlb_4.jpg

infografika_april2020_0.jpg

intrnet_magazin.jpg

books2.jpg

obzornaya_ploshchadka_6.jpg

puti_3_big.jpg

fak_sl.jpg