Mobile app uses a lot of cache memory

Question

I have a problem. I created the android app, when I start the app I see 48,09 MB cache memory. My app uses different libraries, has a lot of classes. I can't find a reason why the app uses so many cache memory? How do I find the problem?

Interesting thing: When I start an empty app, this app uses approximately 4Mb cache memory , I think it's too much.