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I got a customer ticket the other day that said they weren’t worried about response time because “New Relic is showing our average response time to be sub 200ms”. Sounds good, right? Well, when it comes to performance - you can’t use the average if you don’t know the distribution. It’s usually best to use the median, which is also perc50, though you’ll also want to look at your long tail of responses. If you’re not following, then this post is for you....