Whenever you move a page from one url to another, you should setup redirects so the old url still works. This is even more important when you switch domain names, as that's a chief cause of sudden SEO loss.
- they are much slower that regular url redirects
- they can artificially inflate your page views and deflate your bounce rate, painting a too rosy of a picture
- oftentimes there are bugs in the code or there are technical problems that break the redirect without anyone knowing
- and most importantly, you now have to maintain that code and redirect forever until the old page disappears from the Internet.
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