If selectors are going to be a constant, and jQuery will always return the same elements, why not store them in a "constant" variable (there are no constant variables in JS, but just a global one that you do not change). Initialize them with `var spcCommentEditPreview = $('#spc-comment-edit-preview');` outside of the function and then you don't wast time searching for the same element over and over again (granted, it's not much time, but it's totally unnecessary).

Before starting doing this, read the other comments, since all the Javascript is probably going to change.