MATLAB: Is there a faster version of the Lambert W function

Question

I am using R2008b. lamberts(-1,z) seems to be using muPad, and it's really slow. Even the mfun('LambertW',-1,z) version is slow. Is there a faster (non-symbolic) implementation in a later release?

Answer 1

In some situations... http://www.mathworks.com/matlabcentral/newsreader/view_thread/32527