MVC4 Bundling slow when using Scripts.Render

Question

My asp.net MVC4 web project is running very slowly when serving a simple page that renders bundled scripts. However, when I use a 'hardcoded' script tag on the page with the source attribute of the virtual bundle path then performance is much better:

@Scripts.Render("~/bundles/scripts")                            ~ 4 seconds

vs

<script src='@Scripts.Url("~/bundles/scripts")'></script>       < 1 second

My BundleConfig.cs has no special configuration, this is exactly as it appears:

bundles.Add(new ScriptBundle("~/bundles/scripts").Include(
    "~/Scripts/jquery-1.7.2.min.js",
    "~/Scripts/jquery.validate.min.js",
    "~/Scripts/jquery.validate.unobtrusive.js",
    "~/Scripts/jquery-ui-1.9.0.custom.min.js",
    "~/Scripts/bootstrap.min.js",
    "~/Scripts/bootstrap-modal.js",
    "~/Scripts/bootstrap-dropdown.js",
    "~/Scripts/bootstrap-tooltip.js",
    "~/Scripts/bootstrap-typeahead.js",
    "~/Scripts/bootstrap-transition.js",
    "~/Scripts/bootstrap-popover.js"));

My web.config is even configured to optimize in Debug but I have tried running in Release mode and still get the same result:

<compilation optimizeCompilations="true" debug="false" targetFramework="4.0" />

Any ideas why Scripts.Render is so slow?

Nick · Accepted Answer · 2012-11-07 17:50:09Z

4

The problem was with the outdated package I had installed. A simple Update-Package in package manager console and I went from

<package id="Microsoft.AspNet.Web.Optimization"
    version="1.0.0-beta2" targetFramework="net40" />

to

<package id="Microsoft.AspNet.Web.Optimization"
    version="1.0.0" targetFramework="net40" />

Now Scripts.Render() is peforming much better :-)

answered Nov 7, 2012 at 17:50

Nick

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6 Comments

felickz Over a year ago

On 1.1.0 and seeing some insanely large load times for script bundles (10 .js files)... Consistently getting 7-9 seconds... anyone else?

Luke94 Over a year ago

I have this issue as well. Have you found a solution for this?

Pedro Over a year ago

Same here, this issue is driving me crazy, any solution?

MsBugKiller Over a year ago

I have a new package, but it's still slow. Any suggestion? <package id="Microsoft.AspNet.Web.Optimization" version="1.1.3" targetFramework="net45" />

Fabien Over a year ago

I have the exact same problem with the version 1.1.3 of Microsoft.AspNet.Web.Optimization package

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