The high probability of a disk read being necessary for each insert makes this scenario prone to poor performance.
对于每次的insert，需要读磁盘的概率如此之高，使得这种场景往往性能很差。
The compact option magically makes the boot process quicker by merging adjacent disk read requests into a single request.
compact选项可以大大加速引导过程，它会将连续的读磁盘的请求合并为一个单独的请求。
Of course, fetching images from disk is slower than loading from memory and should be done in a background thread, as disk read times can be unpredictable.
当然，从磁盘上获取这些图片要比从内存中加载慢，并且由于磁盘读取时间是不可预知的，所以也应该在后台进程中完成。
Overall average disk-read bandwidth is 344MB/second over the entire Throughput test.
在整个吞吐量测试中，磁盘读取的平均总带宽为每秒 344MB。
Overall average disk-read bandwidth is 344MB/second over the entire Throughput test.
在整个吞吐量测试中，磁盘读取的平均总带宽为每秒 344MB。
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