Does wIPS mode Access point utilize more Bandwidth?

Hi all,
I have around six number of Cisco 1252 Access Points on HReap mode and wIPS submode in one particular location. This was implemented more than six months and it was working fine. Suddenly, I faced Network conjestion and more bandwidth utilization in that location in particular. But, after disabling the wIPS in the AP, The bandwidth got stable and working fine. Not sure, if wIPS will utilize more bandwidth.. Please clarify on the same..
Also please let me know if this will be anywhere related to the RF Heat maps that Cisco NCS will generate? As there is no map uploaded for that location, Will this cause an issue? Need more understanding on this. Please share if any document or information is available.

Here you go
Deployment Considerations for ELM
Cisco recommends that by enabling ELM on every AP on the network meet most customer security needs when a network overlay and/or costs are part of consideration. ELM primary feature operates effectively for on-channel attacks, without any compromise to the performance on data, voice and video clients, and services.
http://www.cisco.com/en/US/products/ps10315/products_tech_note09186a0080b82504.shtml
Sent from Cisco Technical Support iPhone App

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    When I "Show Routing Table" I see two static routes pointing to the ATT router for the Wired/Wireless Interfaces.....
    0.0.0.0 255.255.255.0 (my Gateway) Wired/Wireless
    (my Gateway) 255.255.255.0 0.0.0. Wired/Wireless
    Why?? 
    AP mode should only be working in Broadcast.
    By connecting the Wired Interfaces alone up to my switched network should not use the router at all.
    If you force all traffic to my router all traffic has to be inspected by the firewall
    You create a bottleneck my router interface is 10/100.
    ATT 2 Wire Gateway/Router with pinholes. 10/100/1000 Non managed 24 port Switch Network. Server infrastructure serving DNS/DHCP.
    I decided to buy this after reading it offered Bridge/Access Point mode instead of getting the WAP610 because I wanted to have the option to change to routing mode or AP mode.
    Since my ATT Uverse Router Wireless is “g” it takes forever to transfer files to and from my servers.

    OK If this helps... I am running a SOHO
    2Wire DSL Router with DHCP Off  Assigned 192.168.100.1 as the Router Gateway IP. NAT Enabled All firewall is being handled via 2Wire. Currently 2Wire WiFi is disabled. For the Linksys E4200
    2wire 10/100 interface up-linked into my d-link 24 port 10/100/1000 Layer 2 unmanaged switch.
    DHCP and DNS Servers on d-link switch
    VOIP on d-link switch
    Testing Results WAN Interface Bridge
    E4200 up-linked via 10/100/1000 Internet Interface to d-link network switch.
    E4200 Internet Interface DHCP assigned using MAC Reserved DHCP 192.168.100.22.
    E4200 in Bridge Mode
    Devices connected to 4X E4200 Gig Ports do not receive DHCP broadcast IP Address
    Device Connected to E4200 WiFi do not receive DHCP BroadcastIP Address
    Assign Static IP to my laptop WiFi in the 192.168.100.X range will establish communication but HUGE latency and poor speeds for any traffic internet or internally to any of my servers.
    At times the connection gets lost.
    In this configuration I get the above stated Route Tables.
    If this is layer 2 compliant it should be handing all local subnet traffic via MAC instead of routing.
    I have not taken the time to attempt to reconfigure my 2Wire to go into DMZ Plus mode and allow the linksys to handle all routing,  but from previous attempt with my wrt54 it did not go well. I accepted the slow 2Wire WiFi speeds.
    It is now getting to the point I am looking for better WiFi to local LAN speeds , I also am looking to do Layer 2 and bypass Routing if I can.
    The WAP160 has a 10/100 interface. I prefer gig

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