In Response To 'Re: Re: Re: Re: normalization of a function'
Thank you for the data.
My strategy was to carefully analyze the data for any errors.
I didn't find any.
Next was to use perhaps a small subset of the data with FindFit to try to get good starting estimates for the parameters. These would then be given to FindFit with the full data set to see if it would converge much faster from a good starting point.
Thus far I have not found a fast way to get good starting estimates. But I am still thinking about it. Perhaps you can also think about this strategy.