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He may well be thinking of Microsoft Visual C++, which dates back to 1993 and evolved into Visual Studio. It had a profiler.

This. Thank you. I thought it was Visual Studio. It's been a while...! The games were a wretched mixture of C++, C and x86.

I use VC++ in 96. Just trying to learn a bit of C++!

Doom was developed on NeXT machines, not Windows.

Although the DOS version was compiled using Watcom C, so presumably they'd use Watcom's debugger for testing the DOS version.