[Question] Where is the cache file location?

Everything seems to work perfectly, I really appreciate you guys for making this app and releasing it free and open source, but I'm not very good at looking through source code, and I don't see any mention of the cache location in the docs.

Is cache done entirely in RAM? So does that mean the RSS field of `ps` command will continue to grow up to the 5MB size cache limit I specified? Seems like the RSS is already greater than this so I guess it's possible cache could have no location.