This is really important, alas, you only know it when your ISP has really sucky DNS, and keeps timing out. The other reason which you might or might not be awa

This is really important, alas, you only know it when your ISP has really sucky DNS, and keeps timing out. The other reason which you might or might not be aware of is that many CDN's use dns to map you to one of their servers, and using a resolver instead of open dns directly is the best way to go.