由于异常通常难以快速处理，所以加载额外的类的附加开销可能使操作延迟超出重要阈值。
Because exceptions are rarely quick to process, the additional overhead of loading extra classes may push operation latency above a critical threshold.
但由于使用了延迟加载，在执行大量Select查询时数据库的性能会降低，因为业务所需的数据并不是一下子获得的。
Because of the lazy loading, DB performance reduces when a large number of Select queries are executed, as all the required data for a business case are not fetched at once.
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