VSTO Tip - Stop the built in Ribbon reflection from slowing your add-in's load time
Behind the scenes, when a VSTO addin or customization loads, the runtime uses reflection to search for all Ribbon controls and customizations and automatically adds them to the appropriate extension regions. This process makes it easy for developers as they don’t have to worry about hooking up the Ribbon Tab that they’ve developed to the Ribbon, or add a new menu item to the Office Menu. However, it can make the add-in’s startup time slower if your Office solution has many references
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Read the complete post at http://ericphan.info/blog/2010/11/22/vsto-tip-stop-the-built-in-ribbon-reflection-from-slowing-yo.html