Cookie encryption in a high volume environment

Hi, We would like to know if anyone has used i-rule crypting API to encrypt/decrypt cookie content in a high volume environment (120-130 transactions per second). The following code works well however, will it perform efficiently with tons of traffic? Any benchmarking data or comments would be appreciated.

when RULE_INIT {
     Log debug messages to /var/log/ltm?  1=yes, 0=no.
    set ::debug 1

    set ::cookie "servletAiguilleur.origine"

    key  for use in encryption/decryption operations.
    set ::key [substr [AES::key 128] 8]
    set ::iv [substr [AES::key 128] 8]
}

when HTTP_RESPONSE {
    if {[string length [HTTP::cookie value $::cookie]] > 0}{
         Log the original cookie value from the app
        if {$::debug}{log local0. "\Response from app contained our CRYPTO cookie: [HTTP::cookie value $::cookie]"}
        set cookie_admin [HTTP::cookie value $::cookie]
        set encrypted_cookie [CRYPTO::encrypt -alg aes-128-cbc -keyhex $::key -ivhex $::iv $cookie_admin]
        set encoded_cookie [b64encode $encrypted_cookie]
        log local0. "CRYPTO $cookie_admin encryption : $encrypted_cookie"
        log local0. "CRYPTO encoded_cookie : $encoded_cookie"
        HTTP::cookie remove $::cookie
        HTTP::cookie insert name $::cookie value $encoded_cookie
    }
}

when HTTP_REQUEST {
    log local0. [HTTP::uri]
     If the cookie exists with any value, for any requested object, try to decrypt it
    if {[string length [HTTP::cookie value $::cookie]]}{
        set cookie_admin [HTTP::cookie value $::cookie]
        if {$::debug}{log local0. "\Request to app contained our CRYPTO cookie: $cookie_admin"}
        set decoded_cookie [b64decode $cookie_admin] 
        set decrypted_cookie [CRYPTO::decrypt -alg aes-128-cbc -keyhex $::key -ivhex $::iv $decoded_cookie]
        log local0. "CRYPTO decoded_cookie : $decoded_cookie"
        log local0. "CRYPTO decrypted_cookie : $decrypted_cookie"
        HTTP::cookie remove $::cookie
        HTTP::cookie insert name $::cookie value $decrypted_cookie
    } else {
         Cookie wasn't present in the request
    }
}