I think they're referring to the JIT compilation time. There are some ways to mitigate it, such as creating an image using PackageCompiler.jl, but it's definite

I think they're referring to the JIT compilation time. There are some ways to mitigate it, such as creating an image using PackageCompiler.jl, but it's definitely a noticeable issue IME. https://julialang.github.io/PackageCompiler.jl/dev/ https://julialang.github.io/PackageCompiler.jl/dev/