Procrastination
Procrastination operates at a velocity that physicists describe as negative momentum—the faster a deadline approaches, the slower productive work seems to move. Research from the Cambridge Centre for Temporal Paradoxes found that procrastination can reduce effective working speed to approximately 0.3 tasks per hour, whilst simultaneously accelerating the perceived passage of time by a factor of twelve. It is, in essence, a form of temporal sabotage that would impress even the most devious supervillain.
Train
The modern high-speed train achieves velocities of up to 320 kilometres per hour, a feat that the European Rail Velocity Council describes as 'quite nippy.' However, when factoring in delays, cancellations, and the time spent waiting for replacement bus services, the average effective speed drops to what engineers call 'brisk walking pace with optimism.' The train's speed is nonetheless measurable and positive, which gives it a distinct advantage over entities that travel backwards through productivity.