Faster heroku pushes

Question

We are using heroku with rails, and the pushes take close to 2 minutes total.

I assume most of the time is spent in compiling slug, assets precompilation and bundle install.

Any tips on how to make this faster?

Answer 1

Remove all unused .coffe and .scss assets.

Even an empty file can add 10/20ms to asset precompile time. Also, prefer sprockets' //=require over sass' @import, it's much faster.

Answer 2

To cut down on bundle time, run the following locally after updating your bundle:

bundle package

Or, to also include gems that obtained from git sources as well:

bundle package --all

Then, commit your vendor/cache directory to your repo. When you deploy, this will cause Heroku to use the gems from your vendor/cache directory as opposed to downloading all of your gems from your Gemfile.

It will save a little time, and every little bit helps when trying to make deploys faster.