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.