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How much traffic bandwidth and disk space does Heroku support for a free app?
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Maximum storage of 1GB for mini and hobby-dev and 10GB for hobby-basic and basic plans. Maximum of 20 connections. No in-memory cache: The lack of an in-memory cache limits performance, because the data can't be accessed on low-latency storage.
Throughput. The Throughput plot displays the number of requests broken down by HTTP status code (1XX, 2XX, 3XX, 4XX and 5XX). The throughput (which can be toggled between RPS and RPM in the metrics preferences) is also displayed for each status code in the legend.
Comes with 2.5GB RAM.
Use jemalloc to reduce Rails memory usage On Heroku, you can add jemalloc using a buildpack. For my app, it resulted in ~20% memory usage decrease. Just make sure to test your app with jemalloc thoroughly on a staging environment before deploying it to production.
Heroku free has a 5 MB database and 1 dyno. A dyno is an instance of your application running and responding to requests. In addition, there is a 100 MB limit of your slug, this includes all gems you use. Heroku has a soft bandwidth limit of 2TB per month. More details here - https://devcenter.heroku.com/articles/limits#network-bandwidth
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