memory management, allocation, and garbage collection. Some of this is from Java, but for awhile, Android GC was a nightmare. It's gotten better, but it still

memory management, allocation, and garbage collection. Some of this is from Java, but for awhile, Android GC was a nightmare. It's gotten better, but it still sucks in many scenarios. If you need to support older versions of Android, you can't count on many of the improvements at all to help you. If you've never experienced this, you probably never did any serious performance optimization and things like performance sensitive gamedev on Android.