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name

value

score

weighting

FCP (First Contentful Paint)

Value2.8 s

55/100

10%

LCP (Largest Contentful Paint)

Value4.6 s

35/100

25%

SI (Speed Index)

Value6.6 s

37/100

10%

TBT (Total Blocking Time)

Value40 ms

100/100

30%

CLS (Cumulative Layout Shift)

Value0.004

100/100

15%

TTI (Time to Interactive)

Value3.5 s

92/100

10%

www.screw-jack.com

256 ms

css.css

281 ms

comm.js

14 ms

jquery-1.5.1.min.js

284 ms

banner.js

285 ms

Our browser made a total of 93 requests to load all elements on the main page. We found that 37% of them (34 requests) were addressed to the original Screw-jack.com, 58% (54 requests) were made to Skin.wbscdn.com and 5% (5 requests) were made to Image.tradett.com.223.tradett.cn. The less responsive or slowest element that took the longest time to load (5.2 sec) relates to the external source Image.tradett.com.223.tradett.cn.

Content Size

1.4 MB

After Optimization

1.3 MB

In fact, the total size of Screw-jack.com main page is 1.4 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. 30% of websites need less resources to load. Images take 1.3 MB which makes up the majority of the site volume.

HTML Optimization

-87%

Potential reduce by 63.0 kB

Original 72.6 kB
After minification 61.8 kB
After compression 9.7 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 10.8 kB, which is 15% 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 63.0 kB or 87% of the original size.

Image Optimization

-2%

Potential reduce by 32.1 kB

Original 1.3 MB
After minification 1.3 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. Screw Jack images are well optimized though.

JavaScript Optimization

-23%

Potential reduce by 10.0 kB

Original 43.1 kB
After minification 43.0 kB
After compression 33.1 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 10.0 kB or 23% of the original size.

CSS Optimization

-28%

Potential reduce by 2.0 kB

Original 7.1 kB
After minification 7.1 kB
After compression 5.1 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. Screw-jack.com needs all CSS files to be minified and compressed as it can save up to 2.0 kB or 28% of the original size.

Requests Now

After Optimization

The browser has sent 92 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Screw Jack. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 9 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 the experience of reading tabular or list data using assistive technology, like a screen reader.

High

<dl>'s do not contain only properly-ordered <dt> and <dd> groups, <script>, <template> or <div> elements.

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

Form elements do not have associated labels

High

Links do not have a discernible name

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

Serves images with low resolution

Low

Detected JavaScript libraries

Search Engine Optimization Advices

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

High

Links are not crawlable

High

robots.txt is not valid

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

High

Image elements do not have [alt] attributes

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 Screw-jack.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 Screw-jack.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

screw-jack.com

Open Graph description is not detected on the main page of Screw Jack. 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

China Screw Jack,Ball Screw Jack,Machine Screw Jack,Worm Gear Screw Jack,Bevel Gear Screw Jack Manufacturer,Supplier - Jacton Industry Co.,Ltd.

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

www.screw-jack.com

css.css

comm.js

jquery-1.5.1.min.js

banner.js

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

www.screw-jack.com

css.css

comm.js

jquery-1.5.1.min.js

banner.js

plant.js

js.js

app.js

show.js

jquery.fxMarquee.js

home.js

dialog.css

banner.css

plant.css

logo.jpg

2024051508285717439176.jpg

skype.jpg

qq.jpg

eng.jpg

i1.jpg

i2.jpg

i4.jpg

i3.jpg

i5.jpg

i6.jpg

contactus.jpg

ic1.jpg

ic2.jpg

ic3.jpg

ic4.jpg

order-code-for-cubic-miter-gearbox.jpg

high-speed-manual-screw-jack-bevel-gear-mechanism.jpg

super-small-and-lightweight-manual-screw-jack-with-handwheel.jpg

electric-cylinder-actuator-description.jpg

cubic-miter-gearbox-description.jpg

bevel-gear-ball-screw-jack-description.jpg

order-code-for-bevel-gear-ball-screw-jack.jpg

order-code-for-electric-cylinder-actuator.jpg

hand-operated-screw-jack.jpg

jtp65-small-miter-gearbox.jpg

jca25-jcb25-electric-cylinder-actuator.jpg

jtp90-miter-gearbox.jpg

electric-screw-jack.jpg