First visit

CO2 0.166g

SIZE 533.42 KB

Return visit

CO2 0.008g

SIZE 25.3 KB

Overall this web page has been graded A when it comes to its carbon footprint

This website is hosted using renewable energy or carbon offsets.

Find out more about grades

Emissions calculator



Total: per month

This is equivalent to: Driving miles in a Tesla Model S Watching hours of Netflix (in HD)

At least trees would be needed to offset the CO2 in a year

Page breakdown







23.51 KB




11.65 KB




8.3 KB




488.08 KB




934 B




999 B


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Core Web Vitals

Max Potential First Input Delay

30 ms

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

Largest Contentful Paint

1.0 s

Largest Contentful Paint marks the time at which the largest text or image is painted.


Uses efficient cache policy on static assets

2 resources found

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

Properly size images

Potential savings of 200 KiB

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

Minimizes main-thread work

1.0 s

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

Server Backend Latencies

320 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.

First Contentful Paint

0.5 s

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

Network Round Trip Times

10 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.

Avoids enormous network payloads

Total size was 533 KiB

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

JavaScript execution time

0.0 s

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

Time to Interactive

0.5 s

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

Speed Index

1.3 s

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

Avoids an excessive DOM size

554 elements

A large DOM will increase memory usage, cause longer style calculations, and produce costly layout reflows

Initial server response time was short

Root document took 310 ms

Keep the server response time for the main document short because all other requests depend on it.

First Meaningful Paint

0.5 s

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


* These are assets not hosted on the same domain e.g. tracking scripts, iframe embeds, or files hosted on a CDN.

These measurements are for each new visitor, for returning visitors the footprint would be lower based on caching mechanisms.

Our brackets for the ratings:

  • A+: less than 0.095g

  • A: less than 0.185g

  • B: less than 0.34g

  • C: less than 0.49g

  • D: less than 0.65g

  • E: less than 0.85g

  • F: above 0.85