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Any suggestions on why a VB6 program would be slower when compiled than when running in the debugger? I’m compiling it with “Optimize for fast code.”
Notes:
I measure performance by running the compiled version and the non-compiled version on the same machine. I based my predictions on wall-clock time, since 30 minutes vs. 100 minutes is a big enough difference to be visible.
Several months ago, I configured a debugging tool to attach itself to my program whenever it ran. I totally forgot that I had done this.
Special thanks to Process Monitor for making this very obvious.
Turning it off made the program run fast.
AppVerifier, for those who are curious.