there are a couple of nodes that I constantly find myself changing the default values to something else and almost every time the same values.
My suggestions would be:
VideoIn (DShow9): 25fps, width/height= 320/240. My suggestion 30fps, 640/480 I mostly use it with the webcam in my laptop.
Midinodes, buffer = 10 and enabled = 0. it should be buffer = 0 and enabled = 1
VideoTexture nodes. Wait for every N’th frame = 1, I always change it to 0 to have faster frame rate on generated content.
just my thoughts