When i go to mine out smoothstone, cobblestone, or any other block with my diamond pickaxe, (i have not tested it on any other pickaxe material, or any other tool) it will be fine, as long as i am going one by one everything works fine, until i take my finger off the screen. Instead of the actual 1.5 or so literal swings of the diamond pickaxe, it will swing about 3 times, AND THEN start the 1.5 swings that create the 'breaking' animation on the actual block itself. so to sum it up, when i first put my finger on the screen and begin mining with my pickaxe, it will take about 3 or 4 swings of the pickaxe, (about as long as a stone pickaxe) to break the first block, but as long as you keep the steady train of breaking blocks, it only does it for the first block you begin to mine. It is very annoying as it can triple, maybe even quadruple the time it takes to mine out what im doing. As i said it just affects the very first block i start to mine, and as long as i stay in a train of breaking blocks, it is fine. Please fix this, because it is really ruining my experience of playing minecraft.