43.3 sec in total
1.8 sec
28.2 sec
13.2 sec
Visit costar.com now to see the best up-to-date Co Star content for United States and also check out these interesting facts you probably never knew about costar.com
CoStar, the world leader in commercial real estate information, has the most comprehensive database of real estate data throughout the US, Canada, UK and France.
Visit costar.comWe analyzed Costar.com page load time and found that the first response time was 1.8 sec and then it took 41.5 sec to load all DOM resources and completely render a web page. This is a poor result, as 95% of websites can load faster.
costar.com performance score
name
value
score
weighting
Value4.8 s
11/100
10%
Value17.7 s
0/100
25%
Value19.4 s
0/100
10%
Value5,500 ms
0/100
30%
Value0
100/100
15%
Value35.0 s
0/100
10%
1804 ms
694 ms
693 ms
669 ms
495 ms
Our browser made a total of 99 requests to load all elements on the main page. We found that 85% of them (84 requests) were addressed to the original Costar.com, 2% (2 requests) were made to D.company-target.com and 2% (2 requests) were made to Google-analytics.com. The less responsive or slowest element that took the longest time to load (14 sec) relates to the external source Scripts.demandbase.com.
Page size can be reduced by 4.0 MB (35%)
11.3 MB
7.3 MB
In fact, the total size of Costar.com main page is 11.3 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. 85% of websites need less resources to load and that’s why Accessify’s recommendations for optimization and resource minification can be helpful for this project. Images take 6.1 MB which makes up the majority of the site volume.
Potential reduce by 115.2 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 18.4 kB, which is 14% 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 115.2 kB or 85% of the original size.
Potential reduce by 179.6 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. Co Star images are well optimized though.
Potential reduce by 3.1 MB
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 3.1 MB or 72% of the original size.
Potential reduce by 603.7 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. Costar.com needs all CSS files to be minified and compressed as it can save up to 603.7 kB or 85% of the original size.
Number of requests can be reduced by 38 (40%)
96
58
The browser has sent 96 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Co Star. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 26 to 1 for JavaScripts and from 7 to 1 for CSS and as a result speed up the page load time.
www.costar.com
1804 ms
Telerik.Web.UI.WebResource.axd
694 ms
layout_transformations.css
693 ms
Reset.css
669 ms
video-js.css
495 ms
costar.css
495 ms
WebResource.axd
528 ms
ScriptResource.axd
529 ms
WebResource.axd
528 ms
Telerik.Web.UI.WebResource.axd
439 ms
ScriptResource.axd
437 ms
Telerik.Web.UI.WebResource.axd
439 ms
ScriptResource.axd
438 ms
ScriptResource.axd
406 ms
Telerik.Web.UI.WebResource.axd
1877 ms
conversion.js
173 ms
bootstrap.min.js
171 ms
costar.js
159 ms
demoModal.js
158 ms
video.js
323 ms
loginFunctionsNew.js
324 ms
bf0ed706.min.js
14031 ms
costar_logo-168_45.png
1139 ms
csg-001-16-costarminuteinfographic_final.png
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cs-024-17_slider_30years_final.jpg
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cs-024-17_slider_115billionsf_final.jpg
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cs-024-17_slider_5mproperties_final.jpg
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carrousel_1-5million-listings.jpg
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carrousel_1200-researchersa9bc3e6c06876090b239ff0000412858.jpg
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cs-024-17_slider_14mphotographs_final.jpg
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cs-024-17_slider_47kcalls_final_f2.jpg
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carousel-17_million.jpg
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cushman_wakefield.png
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duke_realty.png
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valbridge.png
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colliers.png
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american-appraisal.png
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transwestern.png
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ubs.png
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sperry_van_ness.png
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nai_global_02.png
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comcastdfd13e6c06876090b239ff0000412858.png
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td_bank.png
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ing_real_estate_02.png
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kastle_systems.png
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metlife.png
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ngkf.jpg
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jll.png
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cbre.png
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henrysmiller-logo-color-102513.jpg
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barclays.png
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deutsche_bank.png
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usaa.png
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irr_logo_web_rgb.png
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cresa-logo.png
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kbs-web-logo.png
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avison-young.png
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pmrg-logo--new.jpg
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lee_logo.png
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daum_logo_cropped72524e6c06876090b239ff0500412858.png
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logo.png
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trinity-partners.png
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stevensonrealestate.jpg
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facebook_white_124px.png
1330 ms
linkedin_white_124px.png
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twitter_white_124px.png
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Telerik.Web.UI.WebResource.axd
1328 ms
lineto-costar-brown-light.woff
811 ms
lineto-costar-brown-light.svg
1192 ms
Login.aspx
988 ms
login_18_cyan.png
341 ms
pixel
541 ms
pixel
2188 ms
jquery.min.js
3720 ms
globalize.js
2125 ms
globalize_culture_en-US.js
3673 ms
main.css
4340 ms
portal.css
4197 ms
windows.js
4275 ms
GeneralFunctions.js
4198 ms
CookieFunctions.js
4273 ms
LoginFunctions.js
4273 ms
LoginModalDialogPolyfill.js
4212 ms
ip.json
6231 ms
costar-home-page-image.jpg
1627 ms
mainnavbgimaged.png
1547 ms
carrousel_left.png
1627 ms
carrousel_right.png
1626 ms
analytics.js
3457 ms
5637 ms
glyphicons-halflings-regular.woff
882 ms
aquant.js
3033 ms
home_hero_03.jpg
825 ms
ect.html
997 ms
collect
410 ms
collect
1269 ms
pixel;r=935313822;a=p-yfeAyTQqHDsDc;labels=_fp.event.Homepage;rf=3;fpan=1;fpa=P0-451103365-1504627144152;ns=0;ce=1;cm=;je=0;sr=1024x768x32;enc=n;dst=0;et=1504627144152;tzo=-180;ref=;url=http%3A%2F%2Fwww.costar.com%2F;ogl=
978 ms
1259 ms
ga-audiences
286 ms
costar.com accessibility score
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
[aria-*] attributes do not match their roles
Elements with an ARIA [role] that require children to contain a specific [role] are missing some or all of those required children.
[role]s are not contained by their required parent element
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
Buttons do not have an accessible name
Image elements do not have [alt] attributes
Links do not have a discernible name
Contrast
These are opportunities to improve the legibility of your content.
Impact
Issue
Background and foreground colors do not have a sufficient contrast ratio.
Internationalization and localization
These are opportunities to improve the interpretation of your content by users in different locales.
Impact
Issue
<html> element does not have a [lang] attribute
costar.com best practices score
Trust and Safety
Impact
Issue
Does not use HTTPS
Ensure CSP is effective against XSS attacks
General
Impact
Issue
Detected JavaScript libraries
Missing source maps for large first-party JavaScript
costar.com SEO score
Content Best Practices
Format your HTML in a way that enables crawlers to better understand your app’s content.
Impact
Issue
Links do not have descriptive text
Image elements do not have [alt] attributes
Crawling and Indexing
To appear in search results, crawlers need access to your app.
Impact
Issue
Links are not crawlable
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
Document uses legible font sizes
Tap targets are not sized appropriately
EN
EN
UTF-8
Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Costar.com can be misinterpreted by Google and other search engines. Our service has detected that English is used on the page, and it matches the claimed language. Our system also found out that Costar.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.
costar.com
Open Graph description is not detected on the main page of Co Star. 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: