Access costco.co.kr. 코스트코 온라인몰

name

value

score

weighting

FCP (First Contentful Paint)

Value3.5 s

35/100

10%

LCP (Largest Contentful Paint)

Value19.1 s

0/100

25%

SI (Speed Index)

Value12.2 s

3/100

10%

TBT (Total Blocking Time)

Value3,070 ms

2/100

30%

CLS (Cumulative Layout Shift)

Value0.391

26/100

15%

TTI (Time to Interactive)

Value20.9 s

2/100

10%

costco.co.kr

678 ms

costco.co.kr

121 ms

www.costco.co.kr

638 ms

styles.f3a189f94df19dabe8c5.css

89 ms

costco_responsive_spa.css

45 ms

Our browser made a total of 120 requests to load all elements on the main page. We found that all of those requests were addressed to Costco.co.kr and no external sources were called. The less responsive or slowest element that took the longest time to load (678 ms) belongs to the original domain Costco.co.kr.

Content Size

3.1 MB

After Optimization

2.4 MB

In fact, the total size of Costco.co.kr main page is 3.1 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. Only a small number of websites need less resources to load. Images take 2.3 MB which makes up the majority of the site volume.

HTML Optimization

-91%

Potential reduce by 713.0 kB

Original 783.5 kB
After minification 726.8 kB
After compression 70.5 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 713.0 kB or 91% of the original size.

Image Optimization

-2%

Potential reduce by 35.2 kB

Original 2.3 MB
After minification 2.3 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. Costco images are well optimized though.

JavaScript Optimization

-0%

Potential reduce by 0 B

Original 8.8 kB
After minification 8.8 kB
After compression 8.8 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.

Requests Now

115

After Optimization

108

The browser has sent 115 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Costco. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 8 to 1 for JavaScripts and as a result speed up the page load time.

Accessibility Issues

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

Buttons do not have an accessible name

High

Image elements do not have [alt] attributes

High

Links do not have a discernible name

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.

High

ARIA IDs are not unique

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

Low

Detected JavaScript libraries

High

Missing source maps for large first-party JavaScript

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

KO
Language Claimed

KO
Encoding

UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Costco.co.kr can be misinterpreted by Google and other search engines. Our service has detected that Korean is used on the page, and it matches the claimed language. Our system also found out that Costco.co.kr 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

costco.co.kr

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

Report Summary

Performance

Accessibility

Best Practices

SEO

코스트코 온라인몰 | 코스트코 코리아

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

costco.co.kr

costco.co.kr

www.costco.co.kr

styles.f3a189f94df19dabe8c5.css

costco_responsive_spa.css

Page Optimization Overview & Recommendations

Content Size

After Optimization

HTML Optimization

Image Optimization

JavaScript Optimization

Requests Breakdown

Requests Now

After Optimization

Network Requests Diagram

costco.co.kr

costco.co.kr

www.costco.co.kr

styles.f3a189f94df19dabe8c5.css

costco_responsive_spa.css

63062a37

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runtime-es5.24d86ed07e3cd948e22a.js

polyfills-es5.a08802bc66e1a623ab20.js

polyfills-es2015.b6840dc6113bf9795a23.js

scripts.a3089741f744541363d4.js

main-es2015.3959e499f858328683da.js

main-es5.3959e499f858328683da.js

239113797304350.css

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65883661664286.svg

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