没有特殊原因，装入所有的存储对象是一种开销。
Loading all of the stored objects could be an overhead for no particular reason.
因为这些工具通常只关注特殊数据，比一个完整的分析器更小更轻巧，所以它们的性能开销要小一些。
Because these tools are generally focused on specific data, they're smaller and more lightweight than a complete profiler, and so they don't incur the same performance overhead.
解压时，通过使用一种特殊的计数器简化控制电路，解压电路硬件开销小且较易实现。
Due to using a special shift counter to simplify the control circuit, the decompression circuit can be implemented easily and the hardware cost is low.
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