4 ms·

<script src="//code.jquery.com/jquery-1.9.1.min.js"></script> <script> window.jQuery || document.write('<script src="/js/jquery-1.9.1.min.js"><\/script>'); </s

• detaro 12y ago
  This still has to time out on the first request to trigger, right?
  • acdha 12y ago
    Yes – you could do something creative with async scripts but then you're transferring too much data for everyone to benefit only the subset of users who experience failures on the first script.