Strange, I have to test this case myself, if possible could you please PM me with a link sample?
This is not an IPS or plugin thing, it's CKEditor behavior, and I think it's normal because txt editors are used to write only plain text not full HTML formatted text, but you have an option to use rich text editor that can detect written urls to overcome this behavior.
Also this one is a CKE behavior, and they strongly recommend not to override this mode by using BR mode for the reasons listed here (This option is totally removed from CKE5).
You've two options for this.
To use shift+enter to make line break by <br>
Overload it programmatically by adding this line at the end of CKE config.js file (NOT RECOMMENDED BY CKE DEVELOPERS😞
a.enterMode = CKEDITOR.ENTER_BR;
The link meta data retrieval speed depends on two factors together, Your internet connection speed and data retrieval speed from the 3rd party remote server.
May I ask a question, is it an individual case? does it happen with all users?