Why is running attached to the debugger so slow?

Question

What is going on that causes a debug build to be so much slower attached to the debugger compared to unattached? They are both the same exe running.

Edit: Most of th

Answer 1

There are a couple of reasons why running with the debugger attached can be significantly slower than unattached. The most likely causes are

• Excessive number of break points
• Breakpoints which have expensive conditionals
• Too many trace points

The first thing to try is disabling all break points and seeing how that effects perf