Synthetic audit tools play a valuable role during the development and tuning of a website. Real User metrics on the other hand provide the source of truth for the actual performance of your site.
The diagram below shows our approach to modern web development and the tools we employ as we move from 'development', through 'deployment' and to 'production'. As the website starts to receive organic traffic, we move away from synthetic lab results towards real field based metrics. We then ensure we tie back the actual impact on the key business metrics. This is how we help customers Accelerate their business, not just their website.