Phoronix-Thread: PERFORMANCE OF FILESYSTEMS COMPARED (includes Reiser4 and Ext4).

http://phoronix.com/forums/showthread.php?1765-PERFORMANCE-OF-FILESYSTEMS-COMPARED-%28includes-Reiser4-and-Ext4%29

http://www.tech-analyser.com/2011/10/understanding-file-systemsntfs-fat.html

Use EXT2/3/4 format in External SD Card in Android

http://www.hackan.com.ar/2013/05/use-ext234-format-in-external-sd-card-in-android/#.Uxv7P8OycYx

In searching which file system gives best performance on SD card, above links showed up from google search