By default in Visual Studio for any web pages design view is the default view. Which may causes some time to load if your page is having many controls . So If you want to change the default view from Design View to Source View, just perform the following steps.
Go to “Tools” > “Options” and Navigate to “HTML Designer” Section.
In the above option settings you will find 3 Start page in option
1. Source View
2. Design View
3. Split View.
By default “Design View” will be selected. You need to change it to “Source View” and click on “OK”.