The Gemara says that Tzurba Derabanan have a hard time with it. There is resistance because you feel like you will be held back rather than advancing. But as is the case with learning in general, once you begin and delve in it becomes enjoyable and rewarding.
The best time to review is at the verge of forgetting. This way it comes back to life. What you worked on last time to make sense out of it well flow easy the second time around. That is akin to harvesting what you sowed. If you don’t review, it is like planting but never coming back around to collect the fruits. You aren’t really internalizing when you just made sense out of it. When you relearn with clear understanding that is when you internalize it.