JuliaFormatter.jl

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It was recently noted in a Zulip chat that JuliaFormatter takes quite a while to load, while subsequent applications of formatting are very snappy. Perhaps specifying a module specific optlevel for JuliaFormatter would be a good idea to reduce the time to first format?

Xref https://julialang.zulipchat.com/#narrow/stream/137791-general/topic/python.20-.3E.20julia

Would doing precompilation via SnoopCompile help in this regard?

I tried it out and it gave an ok speedup

# default
julia> @time format_file("/tmp/testformat.jl")
 10.234360 seconds (4.44 M allocations: 233.703 MiB, 0.72% gc time, 99.93% compilation time)
false


# optlevel 1
julia> @time format_file("/tmp/testformat.jl")
  6.806009 seconds (4.30 M allocations: 226.507 MiB, 2.83% gc time, 99.87% compilation time)

julia> @time format_file("/tmp/testformat.jl") # subsequent calls are still fast, testformat.jl is a file with 400+ sloc
  0.007949 seconds (54.00 k allocations: 3.003 MiB)

optlevel 0 didn't improve the timing any further