# Making use of precompile

**URL:** <https://discourse.julialang.org/t/making-use-of-precompile/7171>\
**Category:** Performance\
**Created:** [November 19, 2017, 5:52pm UTC](https://discourse.julialang.org/t/making-use-of-precompile/7171 "2017-11-19T17:52:50Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![Mattes](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/mattes/32/2667_2.png) [@Mattes](https://discourse.julialang.org/u/Mattes)\
**Post date:** [November 19, 2017, 5:52pm UTC](https://discourse.julialang.org/t/making-use-of-precompile/7171/1 "2017-11-19T17:52:50Z")

</div>

I have a very simple program using ArgParse.jl:

```julia
using ArgParse

function main(args)
    s = ArgParseSettings(description = "Example 1 for argparse.jl: minimal usage.")

    @add_arg_table s begin
        "--max_n", "-N" # an option (will take an argument)
    end

    parsed_args = parse_args(s) # the result is a Dict{String,Any}
    N = parse(Int64, parsed_args["max_n"])
    println("N = ", N)
end

main(ARGS)

```

and if i run it, it is quite slow.

```julia
time ./julia test.jl -N=1                                                                        
N = 1
./julia test.jl -N=1 6.33s user 0.38s system 105% cpu 6.338 total

```

This seems to be and old issue for julia and I know there are a lot of posts about this. The fix seems to be to include **precompile** () in your module, which ArgParse does. How can I load modules faster in Julia?

---

<div class="post-metadata">

**Author:** ![mauro3](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/mauro3/32/292_2.png) [@mauro3](https://discourse.julialang.org/u/mauro3)\
**Post date:** [November 19, 2017, 7:00pm UTC](https://discourse.julialang.org/t/making-use-of-precompile/7171/2 "2017-11-19T19:00:19Z")

</div>

There is not proper solution to this yet. [https://github.com/carlobaldassi/ArgParse.jl/issues/37](https://github.com/carlobaldassi/ArgParse.jl/issues/37) and [Prerelease: MakiE - interactive plotting!](https://discourse.julialang.org/t/prerelease-makie-interactive-plotting/6811) has also some relevant discussions.