F5 APM Slow Performance

Start troubleshooting by figuring out if the issue is network or the JS interpreter on the browser.

We have one issue that comes up pretty often in that there is some extra processing that occurs for document links, and sometimes pages can have a lot of these. That will be visible as extra JS processing in the app rather than network transfer speed.

If it turns out to be that the browser is very busy processing javascript, try this irule:

 suppress document.links processing for a page
 Change "PUT YOUR URI THAT IS SLOW HERE" to the PATH of the HTML file you want to target
 The iRule for suppress document.links patching in one special file.

when HTTP_REQUEST {
    if {[HTTP::path]  contains "PUT YOUR URI THAT IS SLOW HERE" } {
         set insert_noswitch 1
    } else {
         set insert_noswitch 0
    }
}

when REWRITE_REQUEST_DONE {
  if {$insert_noswitch  != 0} {
          REWRITE::post_process 1
  }
}

when REWRITE_RESPONSE_DONE {
    log local0. "uncomment this to see if the rule is firing in the right place"
    set strt [string first {