I test multiplayer on my own machine by running 2 instances of GZDoom. With ZDoom, I can place both windows side-by-side and they would both be updated in real-time regardless of which window I have focused.
With GZDoom, only the currently focused window gets updated; the other copy of the game will stay stalled and freeze until it is within focus again, making testing multiplayer on the same machine impossible...
Running both games with -noidle doesn't help.
When running 2 instances of GZDoom, only 1 seems active
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Re: When running 2 instances of GZDoom, only 1 seems active
I suspect it might be an OpenGL issue. There's nothing in the netcode that differs between ZDoom and GZDoom, as far as I know.
For example, have you tried starting one GZDoom in OpenGL, changing the ini so that it uses vid_renderer 0, starting the other GZDoom so it'll be in software, and then focus on the OpenGL window to see if the software one gets updated?
For example, have you tried starting one GZDoom in OpenGL, changing the ini so that it uses vid_renderer 0, starting the other GZDoom so it'll be in software, and then focus on the OpenGL window to see if the software one gets updated?