Make sure the ExposureTime isn't limiting the framerate. Dividing 1000000µs (=1s) by the current ExposureTimeyields the theoretically achievable framerate.
Set PixelFormat to 8Bit depth.
If you are using a color camera, have the debayering done on the host instead of the camera by setting an appropriate PixelFormat, e.g. BayerRG8.
Lastly, check whether you have a connection problem. WxPropView's statistics bar on the bottom helps you with that. Check out this checklist for ethernet connections in our technical documentation as well.