Quote Originally Posted by 02audionoob
Added weight will not cause speed deviation on a belt-drive turntable until you start to stall it. It will potentially be slower to get up to speed, but once it's there it runs at the same speed it always does - dependent on power frequency. The difference between Pro-Ject's acrylic platter and their glass platter is more than double the amount of weight we're discussing here.
Perhaps, I wonder if the same could be said for my humble Pioneer.