DataFrames.jl doesn't parameterize on its types and tries to rely on function barriers to be fast enough. That's what gives it the speed issue. IMO this isn't t

DataFrames.jl doesn't parameterize on its types and tries to rely on function barriers to be fast enough. That's what gives it the speed issue. IMO this isn't the best idea. It's not difficult to write a data table that's easier to optimize than that, but you would have to give up some of the flexibility.