Buy the buggy pack and quit whining
Seriously, vrc is great, but you must put some time into setting it up. In graphics options, turn off the effects such as smoke and dust. Then you should have no lag. Get the fps displayed on screen, I find anything under 50fps is no good. Also do the transmitter calibration, there's a thread on vrc forum explaining how to.
Lastly, go on the vrc forum and get some buggy set ups as the standard set up is terrible!
HTH