I have recently set up a new RDS instance to test out working with a AWS postgres instance vs a heroku postgres instance. What I've found is that when I load an instance of 1000 entries in RDS its taking 100ms to read where when I do the same thing in heroku its taking 20ms.

I imagine its something I did wrong during set up. I followed https://reinteractive.net/posts/128-heroku-app-backed-by-an-aws-rds-postgres-database for the set up.

Is there something I missing that I should have done after setup?

RDS Build:
Instance: db.m3.xlarge Ram: 15GB Storage: Purpose (SSD)
IOPS: disabled
StorageAmount: 100 GB
Multi-AZ: NO

Heroku Build:
64 GB storage

  • What are the specs on the Heroku hardware? Different systems will perform differently. Jun 10, 2015 at 20:04
  • How do you measure the time? It can be the network speed/latency between the different data centres, too. Jun 10, 2015 at 20:54
  • @JohnM- The heroku is a much weaker machine I believe. It's their basic standard. Added the stats to the post. Jun 10, 2015 at 21:03
  • @dezso Currently I'm running queries in a rails console that gives me a rough time it took to run. Jun 10, 2015 at 21:04
  • Did you check network latency? Did you try timing the insert of 100K rows instead of a mere 1000? Jun 10, 2015 at 21:38

1 Answer 1


So I came to find out that my heroku instance wasn't in the same availability region as my rds instance. Once I changed it over to east coast the RDS DB was slightly quicker then my heroku DB.

Incase anyone is stuck on how to create a rds instance in a different region through aws console, you need to click on region (i.e. Oregon) button in the top right corner and then create your instance.

  • Please mark your own answer as correct (when you can). This may help those who come across the same problem. Thanks. BTW, welcome to the forum.
    – Vérace
    Jun 12, 2015 at 13:26
  • "Availability regions"... There are Regions and there are Availability Zones. Availability Zones (or AZ's) are multiple, isolated locations within each Region. Jan 18, 2021 at 8:21

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