With traditional platter (non-SSD) hard drives (and most DBs, which are 
reading from the disk if the data hasn't been cached to memory), it is most 
efficient to do multiple requests in parallel (rather than serial) because 
this allows the operating system to read the various bits of data from the 
disk in the optimal order using an elevator algorithm to minimize disk 
seeks (http://en.wikipedia.org/wiki/Elevator_algorithm).

Of course, there are limits to how many simultaneous files you can attempt 
to open -- if you're trying to open thousands of files, the 
https://github.com/isaacs/node-graceful-fs module can help manage things.

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