FreeRadius is 3 time quicker when running in full debug mode ( -X option)

Dear Freeradius User list, I am surprised by the fact that freeRadius (Version 2.0.4) is 3 time quicker when running in full debug mode ( -X option). When running freeradius I full debug mode /usr/sbin/freeradius –X I have good response time from remote client were between 200 and 210 ms. But when I launched freeradius without debugging (with exact same configuration): /usr/sbin/freeradius Or /etc/init.d/freeradius start the response time increase to 600ms It is usually the opposite where turning off debugging should increase response speed . Does any body have an explanation? Or any clue to improve performance on non debug Mode ? Thanks in advance for your support. Vincent