My MacBook Pro is taking time to load after signin
It appears that there's some corruption in your old account.

What you need to do is two fold:


Make the new account your primary with the intention of eventually deleting your old account.
Incrementally copy of files and settings from the old profile to the new one until all the files are transferred.


You want to do this in small batches because you don't know what is corrupted and what isn't.  Now, it's highly likely you won't have a problem with documents, pictures, movies and music.  However, there may be a setting (file) for an application that is causing the issue.  

If after a copy, things go awry, you will have narrowed down where the offending file is.

All in all, the solution was and is to create a new user account.