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  • Jean-Francois Dessureault 7 posts 30 karma points c-trib
    Sep 01, 2016 @ 12:54
    Jean-Francois Dessureault

    Very slow page preview in 7.5.2

    I recently updated my staging environment from 7.2.8 to 7.5.2 and, while pretty much everything runs smoothly, I did notice that previewing a page in Canvas Designer takes much longer than it used to do. My production server (which is still at 7.2.8) loads a preview in 750ms, which consistently requires 15-20 seconds on staging (7.5.2).

    The preview toolbar loads fast, but it's the iframe content that seems to get stuck. Pretty much all my request is made up of a wait time during a redirect.

    Chrome DevTools

    Outside of preview mode, the load times are always under 1 second for the same pages.

    It reproduces 100% on any page with 7.5.2, staging and production servers both have the exact same specs. I tried to reproduce locally in Visual Studio, but load times are totally normal on my machine.

    Does anybody have the same problem or ever encountered a similar issue?

  • Bradley Kronson 59 posts 110 karma points
    Sep 26, 2016 @ 12:30
    Bradley Kronson

    I have the same problem, previews can take 60+s to load

    Anyone have a solution for it?

  • Jean-Francois Dessureault 7 posts 30 karma points c-trib
    Nov 09, 2016 @ 20:39
    Jean-Francois Dessureault

    I've tried updating to 7.5.3, then 7.5.4, but still no luck.

  • Bradley Kronson 59 posts 110 karma points
    Nov 10, 2016 @ 05:46
    Bradley Kronson

    Tried that too, no luck

  • Dan Roddis 57 posts 241 karma points
    Nov 22, 2016 @ 11:39
    Dan Roddis

    We've had the same problems since 7.2.2 with slow preview, unfortunately no solution - we avoid using it now due to the length of time it takes.

  • Jean-Francois Dessureault 7 posts 30 karma points c-trib
    Jan 06, 2017 @ 21:54
    Jean-Francois Dessureault

    After further investigation, we've found out that our main navigation was causing the slowdown (GetUrl() method). There is a massive amount of links in that menu, maybe that explain why not everybody was experiencing the problem?

    In any case, updating to 7.5.6 solved it! Preview times are now back to normal on our development server. I hope it will work for everybody!

  • nickornotto 322 posts 694 karma points
    20 days ago

    Indeed, removing the navigation worked for us either.

  • Lazau Florin 74 posts 210 karma points
    May 15, 2017 @ 08:19
    Lazau Florin

    Hi team,

    I have this issue with Umbraco 7.6.1 :)

    This is very sad. It seems the operation on disk is slow. On preview, Umbraco creates a preview xml file.

    My big issue is that I am hosting in Azure Web App and I don't have SSD.

    Any advice would be appreciated.

    Thanks, Florin

  • Peter Holmsgaard 69 posts 106 karma points
    Nov 08, 2017 @ 10:06
    Peter Holmsgaard

    Hi there!

    Did anyone find a solution for this?

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