15mb limiter queue with mask 32 in 2000 customer

[arham]

pfsense 2.5.2 cpu in 100% when enable 15mb limiter with 32 mask in 2000 customer
system spec : Intel(R) Xeon(R) CPU E5-2620 0 @ 2.00GHz
24 CPUs: 2 package(s) x 6 core(s) x 2 hardware threads
AES-NI CPU Crypto: Yes (active)

• list item
  with limiter enable
  

without limiter enable

tell me any solution please