By design, the protocol is meant to eat CPU cycles, so runtime efficiency really does matter.
按照设计，这个协议就是要吃光所有的CPU周期，因此运行效率非常关键。
Overall Sitemaps 0.90 protocol offers an improvement in terms of crawling efficiency that cannot be accomplished using regular sitemap references and robot directives combined.
总的来说，Sitemaps 0.90协议对爬行效率提供了改进，而常规站点地图引用和组合的机器指令无法完成这点。
If memory efficiency and performance are significant, a parser that USES protocol buffers might be a better choice.
如果内存效率和性能很重要，使用protocol buffers的解析器可能是个较好的选择。
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