Is it normal on a client script to have a delay after clicking save when using the saveRecord function? Or is it probable that its related to my code ?

It's "normal" in that your code is doing something before the save action can take place. The delay is most likely related to your code or any other code running on save, yes.

If your code is iterating through any sublists, it could take a while...

@Kit Vera (she/her) any suggestions on how to speed up, or this is just how it is?

That is a good question and depends on what you are doing. Possibly create an array of the lines in memory and iterate over that or use a user event beforesubmit if you can.

Anything taht can be offloaded from client to server is ideal.