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One of the most effective tools for evaluating the performance-related user experience of accessing a webpage is a Waterfall chart.  It depicts a timeline diagram of requesting and loading page resources.  Waterfall charts are broadly used by performance engineers to analyze factors impacting page responsiveness granularly.  It gives full visibility into every single piece of content that is downloaded from the server. It presents all the resources, and it shows them in sequence on the timeline with an indication when every request was issued and when every response was received. As a result, the duration of each load is clearly visualized in the context of other activities on the page. This allows pinpointing bottlenecks quickly on slow webpages.