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How about adding a captcha to the "create lavag account" that shows a LV BD and asks a CLAD-type question?

Lets see how the search bots are working. How do I create or print a 2D barcode ( QR code or PDF417 ) using .NET?

Mutation history only comes into play when your app encounters different versions of the same class at runtime. The classes don't mutate from version 8.5 -> 8.6 -> 2009 -> 2010 during the build. In principle clearing the mutation history might save you a little time during the build since you are eliminating the executable code required to perform the runtime mutations, but I'd be surprised if it was noticable and I'd be really surprised if it reduced your build time by 80%. As Jarod said, the easiest way to clear the mutation history of a large number of classes is to change their namespace. You don't need to rename the class to do that. Try this: 1. Add a new project library named "temp.lvlib" to your project. (I'm pretty sure you don't even have to save the library.) 2. In the project explorer, select all your source code and move it so it is a member of temp.lvlib. i.e. If all your code is in a virtual folder named "src," just drag that folder so it is now a member of the library. 3. Move the src folder out of temp.lvlib and back to it's original position in your project. 4. Remove temp.lvlib from your project. 5. Save all. Total time... ~20 seconds.