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89 pnas.org Last Updated: 9 months

Success 62% of passed verification steps

Warning 15% of total warning

Errors 23% of total errors, require fast action

Mobile

Performance Desktop Score 92%

Best Practices Desktop Score 69%

SEO Desktop Score 90%

Progressive Web App Desktop Score 54%

Performance Mobile Score 62%

Best Practices Mobile Score 69%

SEO Mobile Score 92%

Progressive Web App Mobile Score 52%

Page Authority Authority 61%

Domain Authority Domain Authority 91%

Moz Rank 6.1/10

Bounce Rate Rate 0%

Charset Encoding

Great, language/character encoding is specified: UTF-8

Title Tag 4 Characters

PNAS

Meta Description 0 Characters

NO DATA

Effective URL 20 Characters

https://www.pnas.org

Excerpt Page content

PNAS Skip to main content Submit AboutEditorial Board PNAS Staff FAQ Accessibility Statement Rights and Permissions Site Map Contac...

Keywords Cloud Density

sciences18 articles17 pnas13 latest9 science7 search7 news7 sustainability6 biology6 image6

Keyword Consistency Keyword density is one of the main terms in SEO

Keyword	Freq	Title	Desc	Domain	H1	H2
sciences	18
articles	17
pnas	13
latest	9
science	7
search	7
news	7
sustainability	6
biology	6
image	6

Google Preview Your look like this in google search result

PNAS

https://www.pnas.org

PNAS Skip to main content Submit AboutEditorial Board PNAS Staff FAQ Accessibility Statement Rights and Permissions Site Map Contac...

Robots.txt File Detected

http://pnas.org/robots.txt

Sitemap.xml File Detected

http://pnas.org/sitemap.xml

Whois Is a query and response protocol that is widely used for querying databases that store the registered users or assignees of an Internet resource, such as a domain name, an IP address block, or an autonomous system

Updated: 2019-02-23 / 2 years

Create on: 1996-03-23 / 25 years

Expires on: 2020-03-24 / 6 months 6 days

Tucows Inc. ,US

Registrar Whois Server: whois.tucows.com

Registrar URL: http://www.tucows.com

Nameservers

CARL.NS.CLOUDFLARE.COM

YOLANDA.NS.CLOUDFLARE.COM

Page Size Code & Text Ratio

Document Size: ~106.83 KB

Code Size: ~96.04 KB

Text Size: ~10.79 KB Ratio: 10.10%

Estimation Traffic and Earnings

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Technologies

PWA - Manifest

Manifest is not valid

Your site don't have valid manifest.json, read more in Web App Manifest

Desktop

Server Backend Latencies 0 ms

Server latencies can impact web performance. If the server latency of an origin is high, it's an indication the server is overloaded or has poor backend performance

Properly size images Potential savings of 222 KB

Serve images that are appropriately-sized to save cellular data and improve load time

Speed Index 1.3 s

Speed Index shows how quickly the contents of a page are visibly populated

First CPU Idle 1.4 s

First CPU Idle marks the first time at which the page's main thread is quiet enough to handle input. [Learn more](https://web.dev/first-cpu-idle).

Avoids enormous network payloads Total size was 2,139 KB

Large network payloads cost users real money and are highly correlated with long load times

Minimizes main-thread work 0.9 s

Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this

First Contentful Paint 1.1 s

First Contentful Paint marks the time at which the first text or image is painted

Includes front-end JavaScript libraries with known security vulnerabilities 3 vulnerabilities detected

Some third-party scripts may contain known security vulnerabilities that are easily identified and exploited by attackers

Avoid chaining critical requests 20 chains found

The Critical Request Chains below show you what resources are loaded with a high priority. Consider reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load

Avoid an excessive DOM size 1,062 elements

A large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow)

First Meaningful Paint 1.1 s

First Meaningful Paint measures when the primary content of a page is visible

Keep request counts low and transfer sizes small 59 requests • 2,139 KB

To set budgets for the quantity and size of page resources, add a budget.json file

Serve static assets with an efficient cache policy 32 resources found

A long cache lifetime can speed up repeat visits to your page

Max Potential First Input Delay 120 ms

The maximum potential First Input Delay that your users could experience is the duration, in milliseconds, of the longest task

Time to Interactive 1.6 s

Time to interactive is the amount of time it takes for the page to become fully interactive

Network Round Trip Times 0 ms

Network round trip times (RTT) have a large impact on performance. If the RTT to an origin is high, it's an indication that servers closer to the user could improve performance

Estimated Input Latency 10 ms

Estimated Input Latency is an estimate of how long your app takes to respond to user input, in milliseconds, during the busiest 5s window of page load. If your latency is higher than 50 ms, users may perceive your app as laggy

Minify CSS Potential savings of 7 KB

Minifying CSS files can reduce network payload sizes

Remove unused CSS Potential savings of 82 KB

Remove dead rules from stylesheets and defer the loading of CSS not used for above-the-fold content to reduce unnecessary bytes consumed by network activity

Uses deprecated APIs 1 warning found

Deprecated APIs will eventually be removed from the browser

Serve images in next-gen formats Potential savings of 1,121 KB

Image formats like JPEG 2000, JPEG XR, and WebP often provide better compression than PNG or JPEG, which means faster downloads and less data consumption

Server response times are low (TTFB) Root document took 310 ms

Time To First Byte identifies the time at which your server sends a response

Eliminate render-blocking resources Potential savings of 1,060 ms

Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles

Enable text compression Potential savings of 231 KB

Text-based resources should be served with compression (gzip, deflate or brotli) to minimize total network bytes

Minimize third-party usage Third-party code blocked the main thread for 50 ms

Third-party code can significantly impact load performance. Limit the number of redundant third-party providers and try to load third-party code after your page has primarily finished loading

Total Blocking Time 50 ms

Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds.

JavaScript execution time 0.3 s

Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this

Mobile

Avoid an excessive DOM size 1,062 elements

First Meaningful Paint 3.5 s

First Meaningful Paint measures when the primary content of a page is visible

Keep request counts low and transfer sizes small 59 requests • 3,682 KB

To set budgets for the quantity and size of page resources, add a budget.json file

Serve static assets with an efficient cache policy 32 resources found

A long cache lifetime can speed up repeat visits to your page

Max Potential First Input Delay 410 ms

The maximum potential First Input Delay that your users could experience is the duration, in milliseconds, of the longest task

Time to Interactive 6.9 s

Time to interactive is the amount of time it takes for the page to become fully interactive

Network Round Trip Times 0 ms

Network round trip times (RTT) have a large impact on performance. If the RTT to an origin is high, it's an indication that servers closer to the user could improve performance

Estimated Input Latency 60 ms

First Contentful Paint (3G) 7050 ms

First Contentful Paint 3G marks the time at which the first text or image is painted while on a 3G network

Minify CSS Potential savings of 7 KB

Minifying CSS files can reduce network payload sizes

Tap targets are sized appropriately 100% appropriately sized tap targets

Interactive elements like buttons and links should be large enough (48x48px), and have enough space around them, to be easy enough to tap without overlapping onto other elements

Document uses legible font sizes 99.95% legible text

Font sizes less than 12px are too small to be legible and require mobile visitors to “pinch to zoom” in order to read. Strive to have >60% of page text ≥12px

Remove unused CSS Potential savings of 83 KB

Remove dead rules from stylesheets and defer the loading of CSS not used for above-the-fold content to reduce unnecessary bytes consumed by network activity

Uses deprecated APIs 1 warning found

Deprecated APIs will eventually be removed from the browser

Serve images in next-gen formats Potential savings of 2,475 KB

Image formats like JPEG 2000, JPEG XR, and WebP often provide better compression than PNG or JPEG, which means faster downloads and less data consumption

Server response times are low (TTFB) Root document took 290 ms

Time To First Byte identifies the time at which your server sends a response

Eliminate render-blocking resources Potential savings of 2,820 ms

Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles

Enable text compression Potential savings of 231 KB

Text-based resources should be served with compression (gzip, deflate or brotli) to minimize total network bytes

Reduce the impact of third-party code Third-party code blocked the main thread for 370 ms

Third-party code can significantly impact load performance. Limit the number of redundant third-party providers and try to load third-party code after your page has primarily finished loading

Total Blocking Time 340 ms

Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds.

Reduce JavaScript execution time 1.5 s

Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this

Server Backend Latencies 0 ms

Server latencies can impact web performance. If the server latency of an origin is high, it's an indication the server is overloaded or has poor backend performance

Defer offscreen images Potential savings of 258 KB

Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive

Properly size images Potential savings of 1,135 KB

Serve images that are appropriately-sized to save cellular data and improve load time

Speed Index 4.4 s

Speed Index shows how quickly the contents of a page are visibly populated

First CPU Idle 6.4 s

First CPU Idle marks the first time at which the page's main thread is quiet enough to handle input. [Learn more](https://web.dev/first-cpu-idle).

Avoid enormous network payloads Total size was 3,682 KB

Large network payloads cost users real money and are highly correlated with long load times

Minimize main-thread work 3.1 s

Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this

First Contentful Paint 3.5 s

First Contentful Paint marks the time at which the first text or image is painted

Includes front-end JavaScript libraries with known security vulnerabilities 3 vulnerabilities detected

Some third-party scripts may contain known security vulnerabilities that are easily identified and exploited by attackers

Avoid chaining critical requests 20 chains found

Speed And Optimization Tips

Only Registered Users

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Alexa Rank

0

Local Rank: / Users: / PageViews:

Global Rank

Information Server

Response Header HTTP headers carry information about the client browser, the requested page and the server

HTTP/1.1 200 OK
Date: Sat, 11 Jan 2020 09:45:04 GMT
Content-Type: text/html; charset=utf-8
Connection: keep-alive
Set-Cookie: __cfduid=ded3fea2107aa0627709375433c877c621578735904; expires=Mon, 10-Feb-20 09:45:04 GMT; path=/; domain=.pnas.org; HttpOnly; SameSite=Lax
Age: 0
Cache-Control: public, max-age=900, must-revalidate, proxy-revalidate, pre-check=0, post-check=0
Cf-Railgun: 89c4b5ea7a stream 0.000000 0200 e6be
Content-Language: en
Etag: W/"1578735487-0"
Expires: Sun, 19 Nov 1978 05:00:00 GMT
Last-Modified: Sat, 11 Jan 2020 09:38:07 GMT
Pragma: no-cache
Vary: Cookie,Accept-Encoding
Via: 1.1 varnish
X-Content-Type-Options: nosniff
X-Drupal-Cache: HIT
X-Frame-Options: SAMEORIGIN
X-Generator: Drupal 7 (http://drupal.org)
X-Highwire-Sitecode: pnas
X-Highwire-Smart-Code: pnas_production
X-Varnish: 1695536299
X-Varnish-Cache: 
X-Varnish-Ttl: 
CF-Cache-Status: DYNAMIC
Expect-CT: max-age=604800, report-uri="https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct"
Server: cloudflare
CF-RAY: 5535f4acac20f005-EWR
Content-Encoding: gzip

DNS Records DNS Resource Records associated with a hostname

View DNS Records

Type	Name	Value	Class	TTL
A	pnas.org	104.232.27.118	IN	262
NS	pnas.org	carl.ns.cloudflare.com	IN	39406
NS	pnas.org	yolanda.ns.cloudflare.com	IN	39406

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89 pnas.org Last Updated: 9 months

Desktop

Mobile

Estimation Traffic and Earnings

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Technologies

CloudFlare

Drupal

Modernizr

PHP

Varnish

PWA - Manifest

Desktop

Mobile

Speed And Optimization Tips

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Alexa Rank

0

Information Server

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