I propose to consider adding precompilation to GLM.jl

[Bogumił Kamiński]

I have not benchmarked it, but I feel it should help (most of the work is done on floats with known type)

[Milan Bouchet-Valat]

See #448. Last time I tried, a lot of the time was spent compiling StatsModels formulas. Though precompilation won't hurt.