虽然JIT编译为加快执行提供了一些优势，但是这是以巨大的内存为代价进行的。
Although JIT compilation provides some advantages for speeding up execution, it does so at the cost of larger amounts of memory.
尽管通过JIT编译保持了平台无关性，但是付出了一定代价。
Although platform neutrality is maintained with JIT compilation, it comes at a price.
XCache将避免代价高昂且(严格来说)不必要的花费来重新编译相同的PHP代码去交付一个页面。
XCache avoids the costly and (strictly) unnecessary expense of recompiling the same PHP code to deliver a page.
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