Mathcad 14

I normally use Mathcad 11 without problems (P4 with 3,2 GHz, XP/SP2) and have updated to Mathcad 14 2 years ago. I cannot use Version 14 because it runs only low speed compared with MC 11. To store a Mathcad sheet 11 on hard-disc needs < 1 sec, 17 sec in 14. This is poor performance. A second installation was the same. What can I do?