2.4GHZ clients very slow speeds with AP3600

5508 WLC (7.5.102)
AP36021
We currently have a test WiFi SSID setup that uses basic mac filtering on our WLC's
WLAN is configured with WPA and WPA2 L2 Security with WPA Policy and WPA2 Encryption.
For some reason we seem to be getting very slow speeds on clients with 2.4GHZ
for example speedtest.net I get 70mg upload and 65mg download on 5GHZ devices and about 1-3mg download and 1mg upload for 2.4GZ devices!
AP36021 are dual band with 4 channels (2 x 2.4Ghz and 2 x 5Ghz)
fyi - There are no dropped packets on the client stats via Prime mgmt that use 2.4GHZ
Any ideas here?

Foreign Primary WLC (let me know if you need the Anchor controller ouput as well)
We have 3 ports configured  as 0/12 trunked
interface GigabitEthernet0/12
description + WLC ****
switchport access vlan 999
switchport trunk encapsulation dot1q
switchport trunk native vlan 999
switchport trunk allowed vlan 10,30,40
switchport mode trunk
switchport nonegotiate
load-interval 30
no cdp enable
channel-group 3 mode on
spanning-tree portfast
end
Building configuration...
Current configuration : 330 bytes
interface Port-channel3
description + WLC ****
switchport access vlan 999
switchport trunk encapsulation dot1q
switchport trunk native vlan 999
switchport trunk allowed vlan 10,30,40
switchport mode trunk
switchport nonegotiate
logging event trunk-status
logging event bundle-status
load-interval 30
end
AP switch port config
Building configuration...
Current configuration : 617 bytes
interface GigabitEthernet4/32
description AP36021
switchport
switchport access vlan 30
switchport mode access
switchport voice vlan 20
load-interval 30
speed auto 10 100
wrr-queue bandwidth 5 90 5
wrr-queue queue-limit 5 80 5
wrr-queue random-detect min-threshold 2 70 100 100 100 100 100 100 100
wrr-queue random-detect min-threshold 3 70 100 100 100 100 100 100 100
wrr-queue random-detect max-threshold 2 100 100 100 100 100 100 100 100
wrr-queue cos-map 2 1 0 1 2 4
wrr-queue cos-map 3 1 3 6 7
no snmp trap link-status
mls qos trust cos
no mdix auto
spanning-tree portfast
end
show wlan 4
WLAN Identifier.................................. 4
Profile Name..................................... WLKPV
Network Name (SSID).............................. WLKPV
Status........................................... Enabled
MAC Filtering.................................... Enabled
Broadcast SSID................................... Enabled
AAA Policy Override.............................. Disabled
Network Admission Control
Client Profiling Status
    Radius Profiling ............................ Disabled
     DHCP ....................................... Disabled
     HTTP ....................................... Disabled
    Local Profiling ............................. Disabled
     DHCP ....................................... Disabled
     HTTP ....................................... Disabled
  Radius-NAC State............................... Disabled
  SNMP-NAC State................................. Disabled
  Quarantine VLAN................................ 0
Maximum number of Associated Clients............. 0
Maximum number of Clients per AP Radio........... 200
--More-- or (q)uit
Number of Active Clients......................... 21
Exclusionlist Timeout............................ 60 seconds
Session Timeout.................................. 7200 seconds
User Idle Timeout................................ Disabled
Sleep Client..................................... disable
Sleep Client Timeout............................. 12 hours
User Idle Threshold.............................. 0 Bytes
NAS-identifier................................... hellotest
CHD per WLAN..................................... Enabled
Webauth DHCP exclusion........................... Disabled
Interface........................................ new-byod
Multicast Interface.............................. Not Configured
WLAN IPv4 ACL.................................... unconfigured
WLAN IPv6 ACL.................................... unconfigured
WLAN Layer2 ACL.................................. unconfigured
mDNS Status...................................... Enabled
mDNS Profile Name................................ default-mdns-profile
DHCP Server...................................... Default
DHCP Address Assignment Required................. Disabled
Static IP client tunneling....................... Disabled
PMIPv6 Mobility Type............................. none
    PMIPv6 MAG Profile........................... Unconfigured
    PMIPv6 Default Realm......................... Unconfigured
--More-- or (q)uit
    PMIPv6 NAI Type.............................. Hexadecimal
Quality of Service............................... Silver
Per-SSID Rate Limits............................. Upstream      Downstream
Average Data Rate................................   0             0
Average Realtime Data Rate.......................   0             0
Burst Data Rate..................................   0             0
Burst Realtime Data Rate.........................   0             0
Per-Client Rate Limits........................... Upstream      Downstream
Average Data Rate................................   0             0
Average Realtime Data Rate.......................   0             0
Burst Data Rate..................................   0             0
Burst Realtime Data Rate.........................   0             0
Scan Defer Priority.............................. 4,5,6
Scan Defer Time.................................. 100 milliseconds
WMM.............................................. Allowed
WMM UAPSD Compliant Client Support............... Disabled
Media Stream Multicast-direct.................... Disabled
CCX - AironetIe Support.......................... Enabled
CCX - Gratuitous ProbeResponse (GPR)............. Disabled
CCX - Diagnostics Channel Capability............. Disabled
Dot11-Phone Mode (7920).......................... Disabled
Wired Protocol................................... None
Passive Client Feature........................... Disabled
--More-- or (q)uit
Peer-to-Peer Blocking Action..................... Disabled
Radio Policy..................................... All
DTIM period for 802.11a radio.................... 1
DTIM period for 802.11b radio.................... 1
Radius Servers
   Authentication................................ Global Servers
   Accounting.................................... Global Servers
      Interim Update............................. Disabled
      Framed IPv6 Acct AVP ...................... Prefix
   Dynamic Interface............................. Disabled
   Dynamic Interface Priority.................... wlan
Local EAP Authentication......................... Disabled
Security
   802.11 Authentication:........................ Open System
   FT Support.................................... Disabled
   Static WEP Keys............................... Disabled
   802.1X........................................ Disabled
   Wi-Fi Protected Access (WPA/WPA2)............. Enabled
      WPA (SSN IE)............................... Disabled
      WPA2 (RSN IE).............................. Enabled
         TKIP Cipher............................. Disabled
         AES Cipher.............................. Enabled
--More-- or (q)uit
      Auth Key Management
         802.1x.................................. Disabled
         PSK..................................... Enabled
         CCKM.................................... Disabled
         FT-1X(802.11r).......................... Disabled
         FT-PSK(802.11r)......................... Disabled
         PMF-1X(802.11w)......................... Disabled
         PMF-PSK(802.11w)........................ Disabled
      FT Reassociation Timeout................... 20
      FT Over-The-DS mode........................ Enabled
      GTK Randomization.......................... Disabled
      SKC Cache Support.......................... Disabled
      CCKM TSF Tolerance......................... 1000
   WAPI.......................................... Disabled
   Wi-Fi Direct policy configured................ Disabled
   EAP-Passthrough............................... Disabled
   CKIP ......................................... Disabled
   Web Based Authentication...................... Disabled
   Web-Passthrough............................... Disabled
   Conditional Web Redirect...................... Disabled
   Splash-Page Web Redirect...................... Disabled
   Auto Anchor................................... Enabled
   FlexConnect Local Switching................... Disabled
--More-- or (q)uit
   flexconnect Central Dhcp Flag................. Disabled
   flexconnect nat-pat Flag...................... Disabled
   flexconnect Dns Override Flag................. Disabled
   flexconnect PPPoE pass-through................ Disabled
   flexconnect local-switching IP-source-guar.... Disabled
   FlexConnect Vlan based Central Switching ..... Disabled
   FlexConnect Local Authentication.............. Disabled
   FlexConnect Learn IP Address.................. Enabled
   Client MFP.................................... Optional
   PMF........................................... Disabled
   PMF Association Comeback Time................. 1
   PMF SA Query RetryTimeout..................... 200
   Tkip MIC Countermeasure Hold-down Timer....... 60
AVC Visibilty.................................... Disabled
AVC Profile Name................................. None
Flow Monitor Name................................ None
Split Tunnel (Printers).......................... Disabled
Call Snooping.................................... Disabled
Roamed Call Re-Anchor Policy..................... Disabled
SIP CAC Fail Send-486-Busy Policy................ Enabled
SIP CAC Fail Send Dis-Association Policy......... Disabled
KTS based CAC Policy............................. Disabled
Assisted Roaming Prediction Optimization......... Disabled
--More-- or (q)uit
802.11k Neighbor List............................ Disabled
802.11k Neighbor List Dual Band.................. Disabled
Band Select...................................... Disabled
Load Balancing................................... Disabled
Multicast Buffer................................. Disabled
Mobility Anchor List
WLAN ID     IP Address            Status
4           10.x.x.x          Up
4           10.x.x.x         Up
802.11u........................................ Disabled
MSAP Services.................................. Disabled

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