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I'm using PackageCompiler hoping to create an executable that eliminates just-in-time compilation overhead.

The documentation explains that I must define a function julia_main to call my program's logic, and write a "snoop file", a script that calls functions I wish to precompile. My julia_main takes a single argument, the location of a file containing the input data to be analysed. So to keep things simple my snoop file simply makes one call to julia_main with a particular input file. So I'd hope to see the generated executable run nice and fast (no compilation overhead) when executed against that same input file.

But alas, that's not what I see. In a fresh Julia instance julia_main takes approx 74 seconds for the first execution and about 4.5 seconds for subsequent executions. The executable file takes approx 50 seconds each time it's called.

My use of the build_executable function looks like this: