CODEWITHSUNDEEP
outlookms-officevsto
Vimes
Vimes

Reputation: 11907

VSTO "warmup" setting; Does Outlook think the add-in loaded faster?

I've read that Outlook disables add-ins that take too long to load. That's not usually the case with mine, but I think it's happened on occasion for a couple customers.

I recently discovered the warmup VSTO setting:

A value that indicates that the .NET Framework and Visual Studio Tools for Office [VSTO] runtime load before an add-in loads and reduce the perceived time to load an add-in. Set the Warmup entry to 1, and use it in conjunction with the LoadBehavior entry to reduce the load time for Outlook 2010 and Outlook 2013 add-ins that are deployed by using Windows Installer (.msi). This registry key cannot be set by using ClickOnce.

I'm not sure if that "perceived time" applies to Outlook, or only the user. Does anyone know if this reduces how long Outlook thinks the add-in took to load? Or is it still timing the whole process, .NET and VSTO runtimes included?

Upvotes: 1

Views: 2253

Answers (1)

Dmitry Streblechenko
Dmitry Streblechenko

Reputation: 66255

Warmup key forces Outlook to preload the .Net run-time. This way it will be loaded by the time Outlook starts the timer to calculate your addin's startup time and you will not (supposedly) be punished for having to load a couple hundred megabytes worth of dlls simply for the pleasure of writing your code in .Net.

Upvotes: 2

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