May it be Rstudio problem? I recently updated it to the latest version and started having a similar issue. It sometimes takes me around 10s to save the modification of a .stan file. I had even R crash while saving .stan file. What even worse is after fitting the model, R crash randomly when exporting samples or plotting the posterior. I thought it’s Windows issues, seems Mac also get this. There are many posts on Rstuido forum, but hard to find a solution.
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