Freeradius Load average

Hello, we are using Freeradius 3:0.18 and we see that when we activate accounting logs the load average of the freeradius machine is very height ( 197%) however when we desactivate these logs the load average is less than 10%, our server has 8VCPU and we receive 3000 accounting start / second, is there any solution to reduce cpu consumption when activating detail module ? Thanks Bassem