Hello everyone, I’m developing a Julia-based simulation model that runs from the terminal (no UI). Each time I execute the script, it precompiles all dependencies, which takes quite a long time (around 8 minutes). Is there a way to keep installed dependencies (e.g., JuMP, Agents) precompiled and c…

I think the actual solution is to always execute scripts with julia --project=@. script.jl (possibly replace @. with whatever path your environment lives at) and basically never Pkg.activate during a session. This will activate the correct environment before startup.jl is executed, therefore state…

Since I’m also writing my own code. From my side, I observe it appears that only if I had modified some modules would julia re-compile, e.g. julia> using EM, EM.In Precompiling EM finished. 1 dependency successfully precompiled in 4 seconds. 52 already precompiled.

Odd, precompile caching is the default behavior and it is usually only overwhelmed by frequent-enough environment switching. Just to check our terminology here, are you seeing a Precompiling printout each session?

How are the script’s dependencies set up? If they are not in an environment and you create a temp environment then they cannot be cached. Please post how exactly you run the script and the beginning of the script where you load the libraries you want to use.

Same problem here: How to achieve consistency when using workspaces on Julia 1.11? - #2 by ufechner7 And no, I am not using Revise. In my case, it only happens with Julia 1.11, not with Julia 1.12.

I update the post with more info and as shown it is precompiling everything (I guess) even when I don’t modify anything in the code.

Yes I updated the post with more details, as shown each time I run my code it precompiles everything even when I don’t modify anything. I tried a solution from an old thread but it did not work for me.

Yes I do use Revise for development and my script activate the environment and check for missing packages because it will be used by other people in the future so I have to make sure they have all the dependencies. I will try to remove Revise and see what happens. Thank you

I updated the post with the Project.toml content, the program uses a combination of local modules and installed dependencies and because the program will be used by other people each time I run the code Main.jl it executes this part to check for packages: using Pkg Pkg.activate(".") Pkg.instanti…

So after all the solution was just removing Revise and it run as intended quickly and did not precompile everything each run. Thank you for your help.

How to keep Julia dependencies precompiled between terminal sessions?

New to Julia

hexaeder February 25, 2026, 5:58pm 4

In my experience, frequent precompilation has often to do with code loading from shared environments before activating the actual environment (for example when you load Revise in your startup and activate the env within your script). See also

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How to keep Julia dependencies precompiled between terminal sessions?

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