I only recently noticed that when I do a double jab I dont bring my arm back for the second jab, I kinda just do a double tap where the second punch has no power.
I saw a vid of Oscar de la hoya vs chavez and i saw he has an awsome jab and can do the double with so much speed.

watch tyson at 00:48
[youtube=425,350]RVidWPrBaMg[/youtube]

thats what im talking about, mine feels really slow. Anyone have any tips to overcome the double jab?