Hi, I know there are some other Rails developers on this list. Anyone have advise for me on how to do performance profiling in Rails? In particular, I'm looking to speed up the response time of my actions. To do this, I need to figure out what parts of it are taking up the time. I suspect database access, but I'm not sure how to figure out where. This is a complex action, with a complex before_filter, and view rendering which itself might be taking up significant time in helper methods which access the db too! I'm not really sure how to start. The fact that I really need to include examination of things that happen during view rendering (helper methods, but possibly also db access that might unwise be in the view code itself) makes me especially confused. Most of the stuff I find on the web on this topic is about determining which actions take up most of your apps time, or determining how many concurrent users your app can handle. Neither of those is what I need to do! I need to get into the guts of an already identified action, and figure out how to speed it up. Any advice would be appreciated! Jonathan -- Jonathan Rochkind Digital Services Software Engineer The Sheridan Libraries Johns Hopkins University 410.516.8886 rochkind (at) jhu.edu