Was just logging in to ask same / similar question, and here this was right on top ;)
I'm also using the RTSP input, I see < 1 second delay at input startup, but after 15 minutes or so it's grown to 30 or more seconds. Tried both with and without 'low latency mode' option, and buffer is set to 300ms. Stream is pulled from a Cube 220, 1080p @ 30 @ 10mb/sec, hardwired with only a Gigabit switch (was trying to see how it'd all work 'maxed out' - very nice BTW but for the delay).
Running vMix x64 9.1.0.31 on Win 7, i7 quad (laptop), 8 GB. Running way too much stuff at once - probably should have tried vMix solo on a fresh boot but increasing delay isn't quite what I'd expect anyway from maxing out the machine. CPU running about 15% average, with 1.5 GB free memory. Network utilization right about what I'd expect at 10mb/sec.
On similar subject, any realistic guidelines on how far one can go on the mixing rig? Assuming external encoding (just HDMI output), are 4 or 5 simultaneous live 1080p30 inputs plausible, perhaps along with one or two Flash overlays and a few videos 'in waiting'?
Plans and ideas - tell me about it - job suffers due to obsession, family moves out, lack of sleep causing delusions of being some sort of broadcast producer... (sad music in background).
Thanks,
David McBride