That's mostly Gradle. Jetbrains IDEs are not exactly lean, but Android's use of Gradle is an exercise in patience, even on the command line.
I imagine Android Studio will switch to Bazel sometime in the near future. Every other non-Android Java shop seems to be rewriting their Gradle build files as Bazel configs nowadays. Gradle and Apache Groovy just don't scale.
Android Studio's performance made me loose interess on JetBrain products.
Xeon class CPU, SSD and at least 16 GB RAM should be written on the box.