Updating Meteor to a version > 2.5.3 cause a 6x build time increase. After some investigation I found the problem is related with the version of @babel/parser in dev-bundle/lib/node_modules. Using the last available @babel/parser the problem disappear. Please update the @babel dependencies or versions > 2.5.3 became unusable.
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Yeah, I think I’m seeing this too. I had been too busy fighting with cypress trying to get all our tests to pass after upgrading but did notice it’s taking a lot longer than normal to build. I’ll try take some measurements as well.
Thanks for reporting this. Can you please open an issue on Github?
An issue has been already created from another user:
Build times increased significantly since upgrade to 2.5.6
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