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  • Matt Cheale 8 posts 33 karma points
    Jan 31, 2017 @ 15:29
    Matt Cheale
    1

    Slow retrieval with many children

    Did a quick and dirty Razor file with the following code:

    @{
        var t1 = DateTime.UtcNow.Ticks;
        var blog = Umbraco.TypedContent(1155);
        var t2 = DateTime.UtcNow.Ticks;
        var url = blog.Url;
        var t3 = DateTime.UtcNow.Ticks;
        var abs = blog.UrlAbsolute();
        var t4 = DateTime.UtcNow.Ticks;
    }
    
    Step 1: @((t2 - t1) / TimeSpan.TicksPerMillisecond)<br />
    Step 2: @((t3 - t2) / TimeSpan.TicksPerMillisecond)<br />
    Step 3: @((t4 - t3) / TimeSpan.TicksPerMillisecond)<br />
    No of children: @blog.Children.Count()
    

    The results I got were:

    Step 1: 46
    Step 2: 46
    Step 3: 45
    No of children: 71 
    
    Step 1: 18
    Step 2: 19
    Step 3: 18
    No of children: 33
    
    Step 1: 2
    Step 2: 0
    Step 3: 2
    No of children: 4 
    

    The parent nodes are things like blog and news collation pages that don't use any date based structure. Is this normal? Should I look to move the actual posts out from under this node so these queries are would not be affected?

    Thanks.

  • Stephen 767 posts 2273 karma points c-trib
    Feb 03, 2017 @ 18:27
    Stephen
    0

    At first I could not believe it but... confirmed. There's a reason for it, which has to do with the structure of the Xml cache: every node in there has a collection of child nodes, which can be either property data nodes or child content nodes. When we initialize a node, we go over all children to gather the property data values... which means we also go over child content nodes => the number of children has an impact.

    There's a way to fix this... moving the discussion over to the issue tracker at http://issues.umbraco.org/issue/U4-9487

  • Nicholas Westby 2054 posts 7100 karma points c-trib
    Feb 03, 2017 @ 19:01
    Nicholas Westby
    0

    Is it that slow only on first access, or are subsequent calls to Umbraco.TypedContent / .Url / .UrlAbsolute() also that slow (e.g., in a later HTTP request)?

    If so, that is embarrassingly slow.

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