Mac book air Admin account slower than fresh brand new user account — I have tried a lot to fix I have a Mac book air 2017 running Catalina. I have noticed my admin account being a little slow. Safari launching slower and some other apps slower
I did a test and made a new admin user. I logged out of my account and logged in as that user. Everything is faster. Safari launches and renders pages faster and just feels snappier
I am not saying my computer is un-usable just not as fast as it could be
In order to try to fix problem I have tried the following

remove all launch agents in my user library folder
only Startup necessary software and remove any login items not neceassy
Deleted preferences folder in user library folder
reset safari cache and disable extensions
boot into recovery mode and repair disk
Boot into safe mode and test
Cleaning up hard drive and removing apps and files. I have 150gb free storage out of 500gb

Do you have any other ideas or is it reformat and rebuild time? I haven’t done a fresh install in 10 years and really want to avoid this
&quot;Do you have any other ideas or is it reformat and rebuild time? I haven’t done a fresh install in 10 years and really want to avoid
this.&quot;

If the problem does not appear in a brand new user account, then there is absolutely no need to erase the disk and reinstall the OS. The OS works fine: only the user account is affected.
Some may suggest packing up and moving to a new user account. The trouble is that if you keep doing this every time you come up with a user-account problem, you'll have a succession of different user accounts, which may cause problems with backups, file ownership attributions, etc. And you'll be none the wiser.
The cause is something in the user's Library folder. It could be third-party software that's set to launch at startup, so test by disabling ALL of that. Don't leave any 'necessary' stuff.
You've deleted the entire user Preference folder, which is overkill. I would test whether things improve after you remove the folder, and then restore it if they don't. Move on to the next folder.