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SharePoint Online modern site pages contain web parts that can contribute to overall page load times. This article will help you understand how to determine how web parts in your pages affect user perceived latency, and how to remediate common issues.
Total load time is displayed in test results and is broken down by module load, lazy load, init and render. Improvement opportunities (yellow): Items that may be impacting page load time are shown in this section and should be reviewed and monitored. This may include “out of the box” (OOTB) Microsoft web parts.
How does SharePoint page diagnostics for SharePoint work?
When you analyze a SharePoint site page with the Page Diagnostics for SharePoint tool, you can see information about web parts that exceed the baseline metric in the Web parts are impacting page load time result in the Diagnostic tests pane. Possible results include:
Why is link Web part not generating preview?
@Shawn Eary the Teams link preview does seem like a richer experience. Perhaps the SPO Link web part may get the same treatment down the road. Glad to hear you have found a work around. Sep 10 2020 01:23 PM
Total shows the total time for the web part to module load, initialize and render. It is the total relative time taken by the web part to render on the page, from beginning to the end. Module Load shows the time taken to download, evaluate and load the extensions JavaScript and CSS files. It will then start the Init process.
If you are creating your Web Part specifically for a SharePoint site, and it will consume the SharePoint Foundation object model, you can derive from the ASP.NET System.Web.UI.WebControls.WebParts.WebPart base class and add a reference to the SharePoint object model in your project.
How are web parts built in ASP.NET?
ASP.NET Web Parts — These Web Parts are built on top of the ASP.NET Web Part infrastructure. The ASP.NET-style Web Parts have a dependency on System.Web.dll and must inherit from the WebPart base class in the System.Web.UI.WebControls.WebParts namespace.