Cumulative distribution graph is a commonly used chart type to express the performance metrics in percentile; it plots the percent of users who had performance metric greater or lesser than the threshold for the website.
The graph below shows the CDF graph for web page response time
From the CDF graph above, we see that at the 90th percentile, the web page response time of a website is 10.3 seconds. This means that 10% of the users in the time frame that the data was collected in had an overall web page load time of more than 10.3 seconds.
These are metrics as they relate to systems operations, but the general rules apply elsewhere as well. Also, 10.3 seconds to load a webpage seems…slow.