Welcome to the community, lordgeoff6009!
I'm sorry to hear about the slowness of your WD My Passport
, such behavior is unusual and I'd suggest to back up the data from the drive ASAP if you can still access it. After the troubleshooting steps you've already taken, I'd recommend testing the drive using WD's Data LifeGuard Diagnostics tool.
It will tell us what exactly is the health of the drive and give us details about the SMART status.
Here's a link to the software:
http://products.wdc.com/support/kb.ashx?id=4BEfZf
Make sure you pass the quick and the extended test, I'll be here waiting for your results.
(Be patient while doing the extended test, it might take some time.)
Keep me updated!
SuperSoph_WD