The default value of 2 is fine (that's why its the default ;p). The setting is there so some can set it to "1" to have the tasks run sequentially. The bottleneck is not the CPU or it's cores, but the available disk I/O, as basicly every action of SD Maid does something with files. A huge speed improvement for SD Maid would be faster storage or theoreticly a faster filesystem that allows faster traversing.
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How To Root Samsung Galaxy S Duos S7652 and install CWM in it | DEV-XDA
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