If you play very fast and make a few mistakes, it matters a lot what type of mistakes you make and how severe they are.
If you make a strategy/recognition mistake ( miss the SF3di 0hc in JOB), it will cost you a little. If you make the physical key strike mistake and drop one card from a holding of 2 pair, that's a huge mistake.
The sticky button, mishit button mistakes are brutal because a) you don't hold a good hand and b) what is left is usually not a good hand. Avoid those types of mistakes.