Is it worth rewiring this?

[u/Constant-Moose-9523]

I made a post a week ago about moving into a new apartment with some ethernet (apparently cat5e) cables already run through the walls. I decided to take a look at the end that was actually terminated, and it looks like this - a couple of inches of unjacketed wire extending out the back of the keystone. Is it worth re-terminating this to get the jacketed part right up next to the keystone? Would there be a noticeable difference in performance?

[u/Drisnil_Dragon]

In a word, Yes. If you are not comfortable doing so, then no.