How fast we see the world is probably mostly tied to our ability to process sensory information. A fly have a quite small brain with very little processing and interpretation compared to a human and can thus process it's limited perceptual world faster.
If the above hypothesis is correct I see three possible routes to perceiving the world in slow motion:
Speeding up the brain
By installing augmentations into the perceptual parts of the brain it could theoretically be possible to improve its processing power and thus allow it to churn through all the input faster. This is an unlikely alternative since the brain is already an immensely powerful parallel information processor. Maybe quantum-computational cybernetics could do something in this area but it would probably be far off.
Information Sorting / Blinds
Instead of attempting to speed up information processing, one could try to install something that cuts away unimportant interpretation steps or discards non-important information thus allowing the brain to process the remainder faster. Maybe this could even be achieved by an advanced drug targeting specific receptors or areas of the brain. The effects of doing this would probably be severe in some respect:
Speedup but tunnel-vision and singular focus — useful for hackers.
Speedup but all emotional interpretation and meaning disappears, it's all just movement and reaction — useful for drugged super-soldiers.
Drop all outside awareness but speed up thought (Meditate 1 hour in 5 minutes) — useful for philosophers, mathematicians and maybe monks.
Lastly it seems like the brain have a mechanism of its own to do this. When in a life and death situation many people claim time moved slower. This could be because when the body gets huge levels of adrenaline it kicks everything into overdrive using all resources available to just get through the next few moments. Probably this also works partly like the second alternative — non-essential interpretation and critical thinking is discarded and everything falls down to instincts. Either implants could release high levels of adrenaline artificially, or a drug of some kind could trigger similar responses. Either way it is likely that long term use would be dangerous. Outside a few moments the stress of going on overdrive would start to cause damage and resources would run out.