问题
According to NewRelic the slowest transaction in my application is:
Middleware/Rack/ActionDispatch::Routing::RouteSet#call
It takes about 261 ms app server time.
What is this RouteSet#call? Rails routing mechanism? Is 261 ms a normal value? How to speed it up?
回答1:
If by any chance you are using the "Treat" gem, remove it. Seems like a bug.
https://github.com/louismullie/treat/issues/84
回答2:
In my case, I was using rocket_pants. Its controllers don't inherit from ActionController::Base so it was showing up in newrelic as middleware.
https://discuss.newrelic.com/t/middleware-call-shown-as-web-transaction/25861/8
来源：https://stackoverflow.com/questions/28430614/slow-action-in-rails-application-actiondispatchroutingroutesetcall