[Koha] Slight delay for changes to IntranetUserJS to take effect

Hi, I don't know if it is a bug, a feature, or something wrong in my installation. Can anyone explain why it will take some time for any changes made to IntranetUserJS to take effect? I will save the changes, go to a page, view it's source, and the changes are not seen. I typed till this much, refreshed the page, and the changes are there. Why? Thanks!