full disclosure: (I work for New Relic now) I've also used New Relic developer mode to identify requests that have too many queries, and optimize them. At my l

full disclosure: (I work for New Relic now) I've also used New Relic developer mode to identify requests that have too many queries, and optimize them. At my last job I cut the queries on the homepage by 75% this way. I also used it to look at GC, tuned that, and cut the total response time by about 80%