Actions:

• Install a recent HEAD version of Stack. I'm using d5b5f77
• Run stack new foo yesodweb/simple

Expect: it will generate the output in under 5 seconds

Actual: it takes a full minute to compile the Mustache template

I'm guessing the move over to mustache from hastache triggered this. The Yesod templates may be an extreme case because they include large base64-encoded binary blobs for images. I'll try applying the templates to one file at a time instead and see if it speeds things up.

CC @borsboom @JustusAdam