Thanks for visiting us here today, @mateob.
I have some information about deleting an employee profile. In QuickBooks, when you delete a profile you aren't completely deleting it from the program, you are just hiding it. It is because an employee's file is linked to a transaction. Thus, the hidden profile is still added to your data file size.
If you run through a performance issue, you can condense your file through Condense Data utility tool. For details, please check out this article: Use the Condense Data utility.
I'm also attaching our QuickBooks Data Services FAQ to help you with QuickBooks software. Our Data Services will help provide action items to take to manage your company file.
Drop a reply anytime below if you have follow-up questions or concerns with your QuickBooks file. I'm always here to assist you. Take care and have a wonderful day ahead.