Look into `jussi`:

https://github.com/steemit/jussi

It's a json-rpc reverse proxy specifically designed to sit in front of `steemd` and use a redis cache.

It will also route other json-rpc calls that start with other prefixes (e.g. `sbds.`) to other backend services other than `steemd`, which comes in handy when you want to run `sbds` (https://github.com/steemit/sbds) alongside on the same endpoint... like https://api.steemit.com.

Steem on!

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