BoltDB author here. I'm glad to see that Bolt is working well for the OP! It seems like a great use case for Bolt (multi-core, high read volume, local storage).

There seems to be a lot of focus on the performance improvements by commenters. Using a local mmapped KV can remove a lot of network and serialization overhead, however, I would caution others from thinking Bolt is a silver bullet. There are a TON of use cases where Redis would utterly destroy Bolt (e.g. high random write volume).

The two data stores have fundamentally different designs and purposes. For example, Bolt provides MVCC with fully serializable transaction isolation. If you need that then Redis isn't an option. If you don't need that then Bolt may be overkill.

As always, YMMV and be sure to test out different options based on your requirements.