How much speed will the new iPad faster than the old ones, and iClarifed has made the campared video to tell you the truth:
Check out this video showing a network speed test of the iPad 1 vs. iPad 2 vs. iPad 3.
The original iPad featured EDGE + Triband HSPA connectivity. The second generation iPad was then released with Edge + Quadband HSPA. Now the new iPad 3 features 4G LTE; UMTS/HSPA/HSPA+/DC-HSDPA; GSM/EDGE.
Take a look at the video below to see their network speeds compared.