Comment #4 on issue 388 by [email protected]: Some code is much slower when the debugger is running
http://code.google.com/p/v8/issues/detail?id=388
The current status is that when debugging is activated the full compiler and not the optimizing (frame based) compiler will be used (as of r4820). This leads to code which is ~30% slower, which should be OK when debugging.
However there is one issue which can currently lead to larger slow down of some code. This is the prevention from stopping in the builtins when stepping. When performing a step and a builtin is hit the debugger will just make another step and continue like that until a non-builtin is hit. In some situations this can lead to 1000's of steps beeing performed behind the scenes.
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