Thanks for this little tidbit: I'll be sure to remember it! 0The lower mount has a rubber bit that is supposed to smooth out the transmission of engine vibrations to the cabin. It also allows the engine some movement as well. As this part wears out, the engine moves a bit more, may transmit more vibrations to the cabin, and may also make the car feel more sluggish. An original motor mount on a 2008 with 125k on the odometer is likely to be very worn.
It's amazing how much better the car feels after swapping out a worn one for a new one.