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drfrag wrote:...unfortunately some data structures have changed...

I'm not familiar with the codebase, which data structures would those be?

(Don't get excited, C++ is a read-only(if that) language to me.)

Personally, I started off in gzdoom. I wanted something that ran on Linux, allowed me to jump and look around with a mouse, and supported texture scaling via the xbrz algorithm. As I recall, that last one narrowed things down just a wee bit . :P Usually the "I can't run OpenGL" ones I only see on ...

The real question here, to me, is: why are you so darn concerned about getting "only" 75fps? Most people use 60Hz screens, especially with CPUs/GPUs of that era, and originally Doom was capped at 35 anyway. If it's playable, don't worry about it. If not, make sure your machine's not in Power Save ...