Also, note that ZFS spawns a lot of threads for concurrent IO. So, enable NCQ (check queue length in /sys/block/<drive>/queue/nr_requests) on the drives if it is not set already. Invest into some SSD drive(s) as the L2 cache, which will speed up random IO ops tremendously.
Pagination is used very frequently in many websites, be it search results or most popular posts they are seen everywhere. But the way how it is typically implemented is naive and prone to performance degradation. In this article I attempt on explaining the performance implications of poorly designed pagination implementation. I have also analyzed how Google, Yahoo and Facebook handle pagination implementation. Then finally i present my suggestion which will greatly improve the performance related to pagination.