adMob, firebase.analitycs, purchasing and 150 MB of RAM

Good afternoon!

Finishing my first Unity app (Android only). It seemed that all the main problems were solved. I went to the home stretch.

Added plugins adMob, firebase.analitycs, purchasing. They eat up +/- 150 MB of RAM ...: (( My application uses less.

I read that adMob is so gluttonous because of the WebView.
At purchasing, I tried to remove modules related to iOS, but errors climb (it was a naive idea).

Can anyone tell me how you can reduce the consumption of OP by these modules? From adMob, I only use interstitial and reward ads. Maybe you can somehow disable other types of advertising?
Advertising and purchases are used in many applications, games. I did not notice such consumption of OP from them.

Please tell me and sorry for my english

 

My tests show that these plugins eat up:

firebase: 7 - 40 MB
purchasing: 9 - 13MB
adMob: 42 - 110 MB

Figures are approximate (in turn, I removed the modules and looked at the used RAM)