If particles behaved like software we could have a guess. It could be that time dilation is caused by some underlying physical system having a bottleneck, thus

If particles behaved like software we could have a guess. It could be that time dilation is caused by some underlying physical system having a bottleneck, thus causing the slowdown. The underlying physical system has to evaluate all possible states for a particle in superposition, even if working in parallel. Then i would guess a particle in superposition should always experience the biggest possible slowdown.