$f is a scalar, not an array, so that should be: 

$f = "\x31\xFC\xFF\xFF\xFF\xFF\xFF\xFE\x58\x17\x30\x06\x18\x26\x25\x27
+\x26\x21\x23\x21\x6E\x5D\x53\x46\x17\x2D\x62\x00\x00\xC0\x00\x00\x00\
+x00\x00\x00\x00\x00\x26\x2F\x2D\x2D\x2D\x2E\x2D\x00\x00\x80\x00\x00\x
+01\x50\x59\x12\x00\xA8\x32\xC0\x01\xD0\x26\x25\x22\x22\x89\x33\x60\x8
+0\x80\x26\x18\x7C\xFF";

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In reply to Re^4: How to find out, why my perl code is slow. by jwkrahn
in thread How to find out, why my perl code is slow. by Anonymous Monk

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