Slow Compile After Switching Git Branches

Phoenix Forum Questions / Help
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1

I’ve noticed a pattern that when I switch branches on a Phoenix project, compilation slows significantly and CPU usage skyrockets. Mix prints several alerts that my files are taking longer than 15s.

Initially I thought it was a problem with the Elixir LS extension for VS Code, but I have the .elixir_ls folder ignored. I then thought that the deps or node_modules directories might be the problem, but wiping them out and re-downloading deps did not fix the issue. The only way I have found to get a snappy compile again was to delete the project directory and clone from Github again.

I’m not sure where to look next for troubleshooting. Does anyone have any suggestions?

2

That does not mean anything. ElixirLS might still recompile everything if dependencies between your branches differ.

3

Does this directory need to be deleted after switching branches?

4

Elixir LS runs dialyzer in the background, so it may be that…

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5

How are you compiling the project? Directly with mix compile (or phx.server), phoenix_live_reload (by refreshing a browser bage), something else?

6

Elixir LS runs dialyzer in the background, so it may be that…

I have Elixir LS Dialyzer disabled in VS Code.

@axelson Typically I’m running mix phx.server, and the compiler runs slow in both Mac Terminal and VS Code.