At the moment I believe there are some individual that have mounted the DB to a faster drive(SSD, NVMe) using the docker mount command. Others are using some form of caching system however this is not yet a supported config. Mounting of database files to faster storage is a planned feature for the future. There is a github issue if you want to keep up to date.
Github: https://github.com/storj/storj/issues/2276
Forum discussion: https://forum.storj.io/t/storage-node-performance-improvement-ideas/314/30