test - grabout - Hello.
Results:array (
  'str' => 
  array (
    'tim' => 0.00286197662353515625,
    'len' => 98890,
    'md5' => '1faffe0d7ed71d252143cf3298e38e3a',
  ),
  'out' => 
  array (
    'tim' => 0.002972126007080078125,
    'len' => 98890,
    'md5' => '1faffe0d7ed71d252143cf3298e38e3a',
  ),
)

Ratio (str_concat/outbuf_grab) =0.96293919460934
Done