JIT compilation removed the overhead of interpretation (at the expense of some additional startup cost), but the level of code optimization was mediocre for several reasons.
JIT 消除了解释的负担（以额外的启动成本为代价），但是由于若干原因，代码的优化等级仍然是一般般。
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Since the request for the container can be put in the code, the overheadcost of synchronizing the deployment descriptor with the code is minimized.