acceleration at high tempreature conditions

Yes, Steve. At 973K my box is nearly 3 times bigger than it at 300K. So under this circumstance , is there any possibility to accelerate?
My test results are shown as follow,

speed (percentage) |

  • | - |
  1. default | 100 |
  2. ksapce_modify diff ad | 105.2 |
  3. -sf opt | 100.6 |
  4. kspace_modify diff ad + -sf opt | 103.9 |

So maybe kspace_modify diff ad is my acceleration choice.
BTW, what are your suggestions?
Thanks in advance.