Some debuggers are definitely going to help cut down the development time as they support precisely detect a problem. The debuggers range from Network Sniffing, CSS Errors, Javascript Errors and network resources consumption.
debug
Bugs are Awesome!
As a developer, you already expertise on how to solve a particular problem. But, productivity lies on understanding the problem exactly. Being a developer you know it how to solve only after you know what is the real trouble. So, welcome the bugs; they are your multipurpose opportunities.
XDebug: Optimal Personal Configurations
I initiate XDebug on demand, via URL parameters. But XDebug configurations in php.ini has to be configured accordingly to accept those requests and obey them. Thus, only the scripts that need debugging or tracing or profiling will request the particular service. Keeping memory and CPU free is also important.