The resulting input/output communication (or I/O) between fast internal memory and slower external memory (such as disks) can be a major performance bottleneck.
因此在快速的内存和相对慢速的外存（比如硬盘）之间的输入/输出（I/O）通讯就成了制约算法性能的主要瓶颈。
The communication cost between the processing nodes in parallel processor is the performance bottleneck of the processor.
在并行处理系统中，处理节点之间的通信开销是制约处理机性能提高的主要瓶颈。
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