Cpu utilization high after enable User & Devices Mode

Hi Team,
After enable User & Devices Mode cpu utilization above 50% and some time calls will drops
Asterisk (Ver. 11.21.0): Peers
PBX Firmware: 6.12.65-32
PBX Service Pack: 1.0.0.0

[[email protected] ~]$ top -cd1
top - 00:52:11 up 4:30, 1 user, load average: 5.04, 5.02, 5.00
Tasks: 242 total, 6 running, 236 sleeping, 0 stopped, 0 zombie
Cpu(s): 64.2%us, 1.0%sy, 0.0%ni, 34.7%id, 0.0%wa, 0.0%hi, 0.1%si, 0.0%st
Mem: 264484516k total, 9527664k used, 254956852k free, 221704k buffers
Swap: 4194296k total, 0k used, 4194296k free, 4992556k cached

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
4181 asterisk 20 0 293m 24m 7776 R 99.7 0.0 255:47.30 /usr/bin/php -q /var/lib/asterisk/agi-bin/user_login_out.agi login 21016 2255
4339 asterisk 20 0 293m 24m 7776 R 99.7 0.0 255:17.94 /usr/bin/php -q /var/lib/asterisk/agi-bin/user_login_out.agi login 21017 2256
5178 asterisk 20 0 293m 24m 7776 R 99.7 0.0 251:07.21 /usr/bin/php -q /var/lib/asterisk/agi-bin/user_login_out.agi login 21015 2254
17044 asterisk 20 0 293m 24m 7772 R 99.7 0.0 75:35.30 /usr/bin/php -q /var/lib/asterisk/agi-bin/user_login_out.agi login 21008 2247
17461 asterisk 20 0 293m 24m 7776 R 99.7 0.0 73:46.71 /usr/bin/php -q /var/lib/asterisk/agi-bin/user_login_out.agi login 21007 2246
17478 asterisk 20 0 4858m 69m 14m S 19.7 0.0 10:30.62 /usr/sbin/asterisk -f -U asterisk -G asterisk -vvvg -c

D&U mode has not been supported in years. I suggest not using it

Downgraded to Asterisk Ver. 11.19.0 working fine:innocent: