in reply to Re^3: How to find out, why my perl code is slow.
in thread How to find out, why my perl code is slow.

$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";