Making a multidimensional fit faster

I have this multidimensional fit VI that works it is taking about 30 seconds for the waveform to fit. Does anyone have any suggestion of making it faster? 

In my 2D Gaussian Model I have the 2D gaussian equation with 2 forloops, this is taking about 1 whole seconds for it to calculate and might be the reason it is slowing the code down is there a different way of having this exact model? 

Thanks.