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time perception can be apparently sped up for living organisms through hibernation, where the body temperature and metabolic rate of the creature is reduced. a more extreme version of this is suspended animation, where the rates of chemical processes in the subject would be severely reduced.
time dilation and suspended animation only allow "travel" to the future, never the past, so they do not violate causality, and it's debatable whether they should be called time travel. however time dilation can be viewed as a better fit for our understanding of the term "time travel" than suspended animation, since with time dilation less time actually does pass for the traveler than for those who remain behind, so the traveler can be said to have reached the future faster than others, whereas with suspended animation this is not the case.