网址：Understanding the managed heap
Technical details: how the managed heap operates and why it expands
- 每次 GC 会移动内存块，没回收的移动到一块，使其紧密
- 大内存占用的不移动，因为移动消耗巨大
Key problems with the heap
- 堆内存只增不减
Basic memory conservation
Collection and array reuse
- 重复利用数组，减少浪费
Closures and anonymous methods
- 减少匿名函数的使用，特别是闭包
Anonymous methods under IL2CPP
- Prefer coding styles that do not require passing methods as arguments.
- When unavoidable, prefer anonymous methods over predefined methods.
- Avoid closures, regardless of scripting backend.
Boxing
Dictionaries and enums
- 定义一个类实现 IEqualityComparer
Empty array reuse
- 重复利用空数组
