Exception Rewriting javascript

Hello, According to docs, I think you are doing it on the correct event (HTTP_RESPONSE).

https://devcentral.f5.com/wiki/iRules.REWRITE-disable.ashx

As a first shot, I would try to change from URI check to lowercase PATH check comparision. (Put values on lowercase chars on data group too). And so, I discard "Content-Type" validation, since I set the full path I don't need rewrite.

https://devcentral.f5.com/wiki/irules.http__path.ashx

In addition, I change the obsolete command "matchclass" to new "class match" that offers better functionality and performance.

https://devcentral.f5.com/wiki/irules.class.ashx

So, my iRule woulld be :

when ACCESS_ACL_ALLOWED {
    set my_path_SAP [string tolower [HTTP::path]]
}
when HTTP_RESPONSE {
    if { [class match $my_path_SAP equals dg_my_path_SAP] } {
        REWRITE::disable
    } else {
        REWRITE::enable
    }
}

So, are you sure that slow performance is about javascript? I have had good experiences in increasing SAP performance, just by enabling HTTP2/SPDY in the past.

Regards.