Well, if you have jus transferred all of your data in the new MacBook Pro, it probably indexes all of your hard drive for all the new data to be searched instantly using spotlight. You may see the magnifying glass in the upper right corner of the screen with a small dot blinking in the center.
Indexing may use some RAM, processor and even the hard drive is spinning continuously. It may take a while depending on the data you have. Everyone experiences the same thing, but indexing is essential and it's a part of the OS. So be patient, let it run overnight once, make sure to plug the MacBook Pro to the power.
After indexing is done, open "Disk Utility" and perform "Repair Disk Permissions"
It will make a considerable and visible difference in the performance and it will solve all the issues 🙂
Well everyone thinks that the new MacBook Pro is slow but the indexing takes a while when you transferred the new data (Even when you didn't transfer, it takes a while). Be patient! 🙂
This should solve your problem! 🙂
Let us know what happens 🙂