Tools & Wizards About Us
tech12h.com screenshot

Report Summary

  • 52

    Performance

    Renders faster than
    69% of other websites

  • 90

    Accessibility

    Visual factors better than
    that of 74% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 100

    SEO

    Google-friendlier than
    94% of websites

tech12h.com

Tài liệu học online, giải bài tập sgk hay nhất

Page Load Speed

7.3 sec in total

First Response

791 ms

Resources Loaded

6.2 sec

Page Rendered

301 ms

tech12h.com screenshot

About Website

Welcome to tech12h.com homepage info - get ready to check Tech 12 H best content for Vietnam right away, or after learning these important things about tech12h.com

Hướng dẫn giải bài tập SGK, tổng hợp những đề thi mẫu giúp học sinh học và thi tốt hơn. Cùng với những kiến thức tin học hữu ích

Visit tech12h.com

Key Findings

We analyzed Tech12h.com page load time and found that the first response time was 791 ms and then it took 6.5 sec to load all DOM resources and completely render a web page. This is a poor result, as 80% of websites can load faster.

Performance Metrics

tech12h.com performance score

52

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value7.0 s

1/100

10%

LCP (Largest Contentful Paint)

Value7.0 s

6/100

25%

SI (Speed Index)

Value11.4 s

5/100

10%

TBT (Total Blocking Time)

Value30 ms

100/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value7.6 s

46/100

10%

Network Requests Diagram

tech12h.com

791 ms

tech12h.com

1324 ms

css_xE-rWrJf-fncB6ztZfd2huxqgxu4WO-qwma6Xer30m4.css

261 ms

css_NdVgz6YKifxQUEsW5xls_zI7Pn2F7E5U5Wb29zcu3vo.css

519 ms

css_PGbJgHCUCBf4dg7K9Kt8aAwsApndP4GZ9RuToPy3-Fk.css

764 ms

Our browser made a total of 38 requests to load all elements on the main page. We found that 55% of them (21 requests) were addressed to the original Tech12h.com, 21% (8 requests) were made to S3.tech12h.com and 18% (7 requests) were made to Cdnjs.cloudflare.com. The less responsive or slowest element that took the longest time to load (2.5 sec) relates to the external source S3.tech12h.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 338.6 kB (43%)

Content Size

794.0 kB

After Optimization

455.3 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Tech12h.com main page is 794.0 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. 15% of websites need less resources to load. HTML takes 352.5 kB which makes up the majority of the site volume.

HTML Optimization

-91%

Potential reduce by 322.5 kB

  • Original 352.5 kB
  • After minification 318.9 kB
  • After compression 30.0 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. 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 322.5 kB or 91% of the original size.

Image Optimization

-2%

Potential reduce by 7.2 kB

  • Original 300.6 kB
  • After minification 293.4 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. Tech 12 H images are well optimized though.

JavaScript Optimization

-9%

Potential reduce by 8.8 kB

  • Original 96.2 kB
  • After minification 96.2 kB
  • After compression 87.4 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. This website has mostly compressed JavaScripts.

CSS Optimization

-0%

Potential reduce by 166 B

  • Original 44.6 kB
  • After minification 44.6 kB
  • After compression 44.4 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. Tech12h.com has all CSS files already compressed.

Requests Breakdown

Number of requests can be reduced by 15 (54%)

Requests Now

28

After Optimization

13

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 28 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Tech 12 H. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 12 to 1 for JavaScripts and from 5 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

tech12h.com

tech12h.com

791 ms

tech12h.com

tech12h.com

1324 ms

css_xE-rWrJf-fncB6ztZfd2huxqgxu4WO-qwma6Xer30m4.css

css_xE-rWrJf-fncB6ztZfd2huxqgxu4WO-qwma6Xer30m4.css

261 ms

css_NdVgz6YKifxQUEsW5xls_zI7Pn2F7E5U5Wb29zcu3vo.css

css_NdVgz6YKifxQUEsW5xls_zI7Pn2F7E5U5Wb29zcu3vo.css

519 ms

css_PGbJgHCUCBf4dg7K9Kt8aAwsApndP4GZ9RuToPy3-Fk.css

css_PGbJgHCUCBf4dg7K9Kt8aAwsApndP4GZ9RuToPy3-Fk.css

764 ms

css_xbO11LSSBQvSZ_7w4U4RSp8xDqCDHEljCACeKfJg49c.css

css_xbO11LSSBQvSZ_7w4U4RSp8xDqCDHEljCACeKfJg49c.css

1047 ms

css_6j_kM_lFBpjKiiMCcWiOeu7BL5nIp-9slDeauzjyeCM.css

css_6j_kM_lFBpjKiiMCcWiOeu7BL5nIp-9slDeauzjyeCM.css

801 ms

latest.js

latest.js

33 ms

js_Pt6OpwTd6jcHLRIjrE-eSPLWMxWDkcyYrPTIrXDSON0.js

js_Pt6OpwTd6jcHLRIjrE-eSPLWMxWDkcyYrPTIrXDSON0.js

1060 ms

js_wMq06n34El81cPtKvKVuAehyOEwepE71d1W2gGcEjDE.js

js_wMq06n34El81cPtKvKVuAehyOEwepE71d1W2gGcEjDE.js

1019 ms

js_ZPMVUwauT3CzfUSIYk-Kc3nwhp80i90VcKjYuHm5owQ.js

js_ZPMVUwauT3CzfUSIYk-Kc3nwhp80i90VcKjYuHm5owQ.js

1078 ms

js_rQiIaisqxlUB-QiSQLp5m-Iuozq-55pdckh4RZfoNtg.js

js_rQiIaisqxlUB-QiSQLp5m-Iuozq-55pdckh4RZfoNtg.js

1535 ms

js

js

68 ms

tong.png

tong.png

2217 ms

mathjax

mathjax

117 ms

3_196.png

3_196.png

2172 ms

screenshot_3_30.png

screenshot_3_30.png

2207 ms

jess3_gmail_makingof-11.jpeg

jess3_gmail_makingof-11.jpeg

2216 ms

k1_33.png

k1_33.png

2309 ms

banner-bloga-02-1.jpg

banner-bloga-02-1.jpg

2433 ms

k2_30.png

k2_30.png

2439 ms

k3_25.png

k3_25.png

2498 ms

logo-dark.png

logo-dark.png

284 ms

ico-home.png

ico-home.png

283 ms

sprites-s94cc7b3b3a.png

sprites-s94cc7b3b3a.png

284 ms

bg-section-steps.png

bg-section-steps.png

278 ms

bg-step-left.png

bg-step-left.png

533 ms

bg-step-right.png

bg-step-right.png

542 ms

step-thumb.png

step-thumb.png

1366 ms

step-bg.png

step-bg.png

541 ms

bg-news.png

bg-news.png

786 ms

logo.png

logo.png

801 ms

MathJax.js

MathJax.js

14 ms

config.js

config.js

15 ms

config.js

config.js

17 ms

tex2jax.js

tex2jax.js

18 ms

MathMenu.js

MathMenu.js

11 ms

MathZoom.js

MathZoom.js

13 ms

Accessibility Review

tech12h.com accessibility score

90

Accessibility Issues

ARIA

These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.

Impact

Issue

High

ARIA IDs are not unique

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

Links do not have a discernible name

Best Practices

tech12h.com best practices score

67

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

User Experience

Impact

Issue

High

Serves images with low resolution

General

Impact

Issue

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

SEO Factors

tech12h.com SEO score

100

Search Engine Optimization Advices

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

Language and Encoding

  • Language Detected

    VI

  • Language Claimed

    EN

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Tech12h.com can be misinterpreted by Google and other search engines. Our service has detected that Vietnamese is used on the page, and it does not match the claimed English language. Our system also found out that Tech12h.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

tech12h.com

Open Graph data is detected on the main page of Tech 12 H. This is the best way to make the web page social media friendly. Here is how it looks like on Facebook: