What do you guys use to speed up your project?

I am still learning and now working with a server. I would like to know what are easy tricks you guys use to make the app faster! I already use cdn, but would love more ideas such as caching etc...!

It's super dependent on your particular app.  Caching is something that can be easily done. 

Fragment caching is pretty easy to implement and makes a huge speed difference. I would definitely start there like  William Flanagan  suggested. 👍

Thanks guys!

Not really a speed gain, but an easy optimization. 

If you experience a large amount of traffic or process a large number of jobs, you may experience your web/job workers slowly growing very large in size.  Most just end up restarting the processes, suspecting a memory leak.   But the default Ruby memory allocator is generally the culprit.  Switch to jemalloc - your memory utilization should stabilize. 

https://elements.heroku.com/buildpacks/gaffneyc/heroku-buildpack-jemalloc

https://twitter.com/gammons/status/1186333632090247168