Safari 6 Performance – How to Fix Freezing Issues

Could you post a link to the site? Does the behavior differ in Chrome or Safari? It could be a problem from the site programmer.

If the main idea is scripting Safari, I would try using Automator before trying AppleScript. I'd start by hitting the record button and then:

• Open Safari
• Navigate to your webpage
• GET by saving the webpage source
• Allow the page to do whataver AJAX calls you may want it to do
  • save the webpage source again
• Fill out a form, hit submit for your POST
  • save the webpage source yet again

Or you could try AppleScript with something like this:

tell application "Safari"
    tell window 1
    set current tab to (make new tab with properties {URL:"http://www.example.com"})
    end tell
end tell

You can add to the script form fills and submit buttons with javascript:

do JavaScript "document.getElementById('field').value = '" & myvalue & "'"
do JavaScript "document.forms[\"form\"].submit();"

I'd try this out within the JavaScript console within a web browser first to make sure you have the names of everything correct.