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I have been studying the performance of a website I am building, and notice a curious thing that I can't find the answer to: two requests (always the same two) mysteriously have prolonged stalled times adding drastically to the overall page load.

Network analyzing in Chrome F12 tools

As you can see, the /css and /js pages are stalling for seemingly no apparent reason. Would anyone know what's going on (please say so if you need more information)?

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  • Answer is as simple as <it's server or network side> :) You must provide too many details, or specify one to get an answer.
    – GioMac
    Nov 20, 2015 at 16:12
  • What does the grey in the timeline mean? If you hoover on it with your mouse pointer, what does it tell? Other things, how are you loading the css and js files? Via a javascript or normal <script> ecc tags?
    – Fredi
    Nov 20, 2015 at 16:25
  • @Fredi The gray means stalled. I was asking why the requests are stalling. I am generating the /css and /js files through PHP (perhaps that has something to do with it).
    – Krii
    Nov 20, 2015 at 16:34
  • @Krii, ok from here: developer.chrome.com/devtools/docs/network (I suppose is what you're using) seems that it's time spent in your browser. As to why or how, as for the link, maybe you've reached the 6 parallel connections that chrome uses. If this is the case, can you remove, let's say, an image from your page and retry?
    – Fredi
    Nov 20, 2015 at 16:39
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    Like you said, Krii, my instinct tells me this is related to PHP performance. IIRC, the gray bar means that the connection was initiated and the green bar means receiving data. Therefore the time from request to first-byte is large which points to PHP.
    – Eric Wendelin
    Nov 20, 2015 at 17:51

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ok from here: http://developer.chrome.com/devtools/docs/network (I suppose is what you're using) seems that it's time spent in your browser. As to why or how, as for the link, maybe you've reached the 6 parallel connections that chrome uses. If this is the case, can you remove, let's say, an image from your page and retry?

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it seems that the first start bit is taking so much time.You can test your performance on Pingdom or Gtmetrix you will get a clear idea where you need work exactly. For loading time of first bit you need to contact your hosting provider.

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