Sluggish/Unresponsive Speedometer

[VandBMdub]

I've got an 2002 3.0i with 67k miles, and this has been driving me nuts. Is anyone else's speedometer slow to react when slowing down?

I haven't noticed it much while accelerating, but when cruising down the high way, if I let my foot off the gas, the speedometer doesn't register a speed change right away. I can feel that I've slowed down, and not that I'm coasting at the same speed.

Traveling the other week, I was cruising between 70-75. I got caught between a few cars and slowed down a bit. Once I got around, I noticed the speedometer was stuck at 69. I got a GPS speedometer app up on my phone, and I was able to fluctuate my speed between 65-75 with no change. I eventually got off on my exit, and once the car was going significantly slower, the speedometer finally started to drop.

Any thoughts or suggestions on what to fix or take a look at would be greatly appreciated!