In the last few weeks Total finder has become extremely slow and laggy on 10.10.5. Often it will take a while (seconds to bring the visor instead of being instant like usual), or show the contents of the folder. It will be okay for a while, and then slows down again a bit later.
The process looks normal and doesn’t appear to be taking any excessive CPU time.
MBP Pro Retina mid 2014 16gb ram, 512gb SSD.