CPAN Algorithm::Diff method:

    time to compare 105 file pairs, 10 times:
    
    926.7 sec
    924.2 sec
    
    time to compare 105 file pairs, 1 time:
    
    91.02 sec
    91.09 sec
    91.09 sec
    91.10 sec
    90.93 sec
    91.19 sec
    93.42 sec
    91.58 sec

    avg time for a single comparison of 105 file pairs:
    
    92.23 secs

diffutils method:

    time to compare 105 file pairs, 10 times:
    
    16.76 sec
    16.65 sec
    16.67 sec
    16.68 sec
    16.85 sec
    
    16.71 sec
    16.72 sec
    16.80 sec
    16.92 sec
    16.84 sec
    
    avg. time for single comparison of 105 file pairs:
    
    1.676 secs