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RUM Speed Index

The term“RUM Speed Index” is used to indicate the speed at which a web presence is loaded in the user’s web browser. The abbreviation “RUM” refers to the English term “Real User Monitoring”, which translated into German means something like monitoring real users. Behind this is a method for the precise analysis and measurement of the loading times of a website, which is based on the resource timings of the browser.

General information

is a service which, in a passive way, determines performance data of the accessed web presence directly via the user’s web browser. Various data is collected as part of the process, such as:
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  • the location of the visitor
  • the device used to access the website
  • the operating system used
  • the exact browser type

The performance data is determined via the resource timing interface of the browser.

After the web page is fully loaded, data can be read about the load times of each resource embedded within the scope of the accessed web page. The RUM Speed Index provides the following information:

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  • The exact duration until the first byte of the web page is loaded.
  • the total loading time of the page
  • the exact duration of establishing the connection and all redirects
  • the time elapsed between sending and receiving

What is the significance of the RUM Speed Index for the sustainable success of a web presence?

From SEO’s point of view, web presences with short loading times are clearly preferable. If a website loads quickly and is presented to the visitor without delay, the website will be visited and used regularly. However, if a website takes a long time to load completely, this circumstance can have some extremely negative consequences.

For example, it can cause visitors to become impatient and check that they have typed in the correct URL or, in the worst case, even abandon the page load. This can cause websites to lose visitors very quickly.

Online shops

It is particularly bad for online shops, as potential customers then simply buy the desired products or services from another provider.

Another negative consequence of too long loading times is the inoperability of the accessed website. While all visual elements of the website, such as photos, videos or control elements, are already loaded, however, no interaction with the page is possible. This also usually leads to the website being used less readily, which in many cases has a negative effect on visitor numbers.


From the information provided by the RUM Speed Index

, it is possible to see whether optimisations need to be made to the website in question. If loading times are to be reduced, it is advisable to carefully check the size of each resource that is loaded as part of the website. Reducing the size of audio, video and image files by converting them to a different format can go a long way in improving the loading times of the website. Removing background images can also speed up the loading process.

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