Hey, TheMacGenius82.
I see that your MacBook Pro slows down when you open a folder that contains 3000 files. You're wondering if this is normal, and I'm glad to help.
Use safe mode to isolate issues with your Mac -- Restart your Mac in safe mode and see if it opens the folder more quickly. If everything works as expected while in safe mode, reboot normally and test again in your own user account.
Get file, folder, and disk information on Mac -- There may be 3000 items in the folder, but it's the amount of information that it's holding. If safe mode didn’t resolve the issue, control-click on the folder in Finder and select "Get Info" to see how large it really is.
Let me know how that goes, and take care!