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Website speed testing metrics are useful when you understand what do they mean and which are the most important metrics that you need to consider. Below is a list of metrics used in website speed testing that you may find useful, here are the metrics and their definitions:

First byte – Delay between the first HTTP request from the web browser and the reception of the first byte of the web page by the browser
It’s recommended a time less than 200 ms

DOM Ready – Delay between the first request from the web browser and the first display on the user’s screen
It’s recommended that the visible part of your web page appears in less than 1 second

Load time – The web page is fully loaded, all the resources are fetched, parsed and executed
Page must be loaded within 4 seconds

Page size – The total size of assets loaded: CSS, JS, HTML + other

Page score – The score calculated based on a number of factors: compression of the resources, enable/disable caching, CSS/HTML/JS minifying etc

Run a website speed test now to check how fast is your website and find potential improvements.