I'm not familiar with how other (non-U.S.) tanks cycle after firing, but I assume that's an automatic part of the cycle that elevates the gun tube slightly to position it to help load the next round. I'm guessing it's designed to place the breach at the optimum angle to reload.
I doubt crews would consider this a limitation, and some would probably say it helps with reloading. I personally feel very comfortable with the idea that my Abrams is keeping the gun laid on target and not moving around at all while reloading / tracking the next target. Our loaders don't have any issues with reloading in that position.
Most M1s will do 40-45 mph on level ground, but you do see some variation from one tank to the next. You'll always hear guys make claims about going 60 mph (or more) in a tank, but it's equipped with a governor to keep it from going too fast. It's capable of going faster, but for the safety of both the tank and crew, it's limited to the 40-45 mph range.Also, I understand the Abrams is a fast beast, but how fast is it (max speed and acceleration), is it compared to our ally's tanks?
One neat fact about the M1 is that it has two gears in reverse - it's strange at first to be backing up and feel it shift gears. Not many vehicles have that feature (I'd be interested to know if other tanks do). This allows us to back up and displace from one position to another very quickly.