Multiple finder preference plists in mavericks I’ve had a very sluggish Finder recently on my Mid-2012 MBP 16GB 2.6GHz i7. 

Looking online I found that deleting the Finder preferences can solve the issue, but when I went to the Preferences folder to look for com.apple.finder.plist I also found files like these: com.apple.finder.plist.DUkfEQe and com.apple.finder.plist.DUkfEQe2 and others with random strings at the end. Any idea what these are and which one is my 'actual' finder plist?
The com.apple.finder.plist file is the actual file.  I believe the ones with a random extension are renamed originals used to hold the changes until the .plist file is updated and then are deleted.