Are there any option to persist query caches?

[miratcan]

(If there is it can be run very fast I think.)

[fenchu]

Tinydb is just a dict of objects keyed from "1" and upwards,
It is intended as a simple structure for small datasets.
You can cache on the outside by adding a wrapper around the db.search() routine.
if you need this then go for redis or another database.