[bluesnowmonkey]

We use New Relic but I've found it less useful than expected for performance tuning.

The UI can show you the slowest requests over the past hour or so, but those tend to be outliers involving some kind of cache miss. I want to be able to see typical requests.

If you drill down into one of those slow requests, it will show all the SQL statements executed and how long each took. We use ActiveRecord though, so going from an SQL statement to a line of source code is painful. I wish it showed the stack trace for each SQL statement.

Finally, it does not seem to have the kind of embeddable performance panel linked in the article. That would be super handy.