Thanks for that, yes you're write I was being dumb.

Just to give an example of how slooooow, reading a 48mb csv files with a 
mixture of strings and numbers with DataFrames's readtable, then writing it 
gives:

*julia> **@time writetable("data.csv", r)*

elapsed time: 3.539380236 seconds (77981180 bytes allocated)

*julia> **@time serialize(open("data.dat", "w"), r)*

elapsed time: 83.743085747 seconds (3439332792 bytes allocated)

Lots of time seems to be spent in string.jl >> print_escaped.

Surely there is some improvement that can be made to this? If print_escape 
is the bottle neck couldn't it be rewritten in c?

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