But I know what you mean. ResinDB is a library that let's you embedd a database inside of your application. It's not a service such as MongoDB. MongoDB load and keep indices in-memory. That's the fastest type of architecture you can have if you want to answer quickly to queries. To have it all in-memory.

Well, there _is_ one faster way. It's to construct a smart index file, bitmapped, stored on a SSD, where the data is laid out in such a way that reading from it is just as fast or faster than reading from an in-memory data structure. This is what Resin achieves.