XRebel

XRebel provides developers with real time insight into application performance during initial development to help them understand and resolve performance issues early on. XRebel is a browser widget that profiles your application server all the time. It raises issues with slow requests and excessive IO, allowing you to quickly find the root cause.

Key Features:

• Application profiling: Track the time spent on each request. Find slow methods and make them run faster
  
• Messages and jobs: Monitor messages and background jobs. Fix resource hogs
  
• Database and NoSQL: Get insight into database activity. Spot methods that query too much
  
• Exceptions: Discover hidden exceptions. Follow the stack trace and fix the problems