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Learn about features to improve performance in pages in SharePoint. These features can be used to enhance the experience in geographically distributed implementations. This article provides instructions that will help optimize performance in SharePoint.
Designing pages to make them as small and responsive as possible complements these performance improvements. Minimal Download Strategy MDS relies on the ability to download only specific portions of a page that is rendered fully on the server. Downloading only the specific portions provides a very efficient loading model. The fully rendered page is not returned to the client. The server must be able to accurately identify those pieces that must be part of the response and those that are not necessary.
The pieces that may or may be not part of the response include scripts, styles, and markup. The following figure shows the MDS architecture. The MDS framework assumes that a master page defines a chrome and content regions. In MDS, SharePoint navigating to a page means requesting just the content for those regions and the resources that the page depends on.
Once that content downloads to the browser, script code applies the markup or resources to the page as appropriate. The browser behaves as if the requested page had been loaded completely from the server.
When users are browsing a SharePoint website in MDS mode, they will not cause full page postbacks and full page reloads. Instead, the URL for the page they are visiting will remain the same, and the fragment identifier a " "sign will change to contain the page they are visiting. The format of the URL is: By default, there is an instance of AjaxNavigate available for you to use named ajaxNavigate.
To use the ajaxNavigate instance:. When the handler is called, your callback function receives a reference to the navigation object and the parsed hash values in a dictionary. The control or Web Part can retrieve the value for the parameter of interest from the dictionary, compare it to the current value, and decide what action it needs to take. A common action is to send an AJAX request to the server to retrieve some data or reorder the items in the view.
The format of hash marks in the URL is: The following code example shows how to update the hash marks. If you find that the pages in your website constantly fall back to download the full page, you might want to consider turning the MDS feature off. You might also want to turn the MDS feature off if you need to use a different strategy to improve performance.
A particular element in the page must make sure that the critical resources needed to work are known to the MDS infrastructure at server rendering time. To convert an existing project to use MDS, you need to update the following files and components:.
The main change in the master page is to surround the regions of HTML markup that will be sent to the client with a special control named SharePoint: The most common parts that need to be surrounded by a SharePoint: AjaxDelta control are the controls embedded in the master page chrome and the content place holders.
If a control is the same on all pages within a site, it should not be wrapped by a SharePoint: The following markup shows a visible content placeholder surrounded by a SharePoint: The following markup shows a menu surrounded by a SharePoint: AjaxDelta control should not be nested within itself.
In previous versions of SharePoint, some pages write content by using the Response. If you are using MDS, this is no longer allowed. You have to change the calls to Response. Output to use a new API. If a page, control, or Web Part directs its output to the Response. Output property, it causes MDS to fail back.
When MDS fails back, it performs a full navigation to the requested page. You can find the offending control by using the DeltaPage. The introduction of the SharePoint: ScriptBlock in the page can change the scope of variables in page. To test this, load the page in the browser after you perform updates.
To use a custom master page for errors in MDS mode, you must define an AjaxDelta in the error master page that has the id property set to the string "DeltaPlaceHolderMain". The content of the error message must be rendered into the AjaxDelta.
Here are the rules for filtering when a page is rendered in MDS delta mode:. If the first argument is not of type Page and the control falls under a SharePoint: AsyncDelta , the scripts will execute in the browser. The public object model in SharePoint was designed to provide an alternate method to register the resources. The methods that do not provide the current control as an argument are still in the API for backward compatibility.
You can navigate between two pages by using a new function named SPUpdatePage. After you understand the composition of a page, you can use different methods to optimize the download experience for that page. In general, the goal is to minimize the number of round trips between client and server computers and to reduce the amount of data that goes over the network.
The guidance in this article includes recommendations that you can apply broadly to a variety of different implementations of SharePoint. Table 5 shows example loading times that illustrate the difference between the first, second, and subsequent page loads. Loading times might be different in your particular scenario. Loading times are affected by many variables, including, but not limited to, page size, latency, and server load. You should categorize page optimization techniques into one of two categories: Optimizations for the first page request page load time 1 or PLT1 are those kinds of optimizations that are effective the first time the page is requested, but that don't necessarily affect subsequent page requests.
The following are some optimizations for PLT Optimizations for subsequent page requests are those that can improve the user experience for a subsequent page load.
You can find a variety of tools to automate file crunching by searching the Internet. Verify that the compressed versions are deployed to production servers. This example shows how a CSS file can be reduced in size through some relatively simple rewriting. You can usually find ways to achieve the same styling and reduce the size of your files by efficiently rewriting your CSS files.
The following example shows how to optimize the previous CSS size by inheriting the styles from a parent element. Entity tags ETags can cause the client to unnecessarily reload files. ETags are meant to uniquely identify files by using a number that the server generates.
In clusters of servers, each server will create a different number.