The median has its problems too. If you only look at the median page load time, you won't even be aware of huge problems like 40% of your visitors with slow int

The median has its problems too. If you only look at the median page load time, you won't even be aware of huge problems like 40% of your visitors with slow internet connections not being able to load your page at all. If huge effects don't move users across the median, the median won't reflect those effects at all. To me, it's not clear that there is a "most appropriate" number. All mappings of a distribution into a number will throw information away - the trick is to pick a number that keeps the information you want. And that seems to depend on the context.