Motion effects panel clunky and difficult to use.

I'm coming to the end of a long project that, for reasons of necessity, has made substantial use of the Motion effects panel, notably position and scale.

Due to the nature of the assets I have been working with, images and graphics of varying sizes, the most effective means of setting parameters is to click and drag over the position and scale properties, or at least, it should be. In reality, in doing so I experience lag and an absence of any granular control. What invariably happens is that as I drag a property, the asset (image) doesn't update its position or scale in the viewport until several seconds later. Then, as I drag, very often the asset will move around wildly, updating with stuttering, jerky movements that make it very difficult to accurately position.

Is this something that other users have struggled with? Is there something I can do to alleviate it?

Prem 14.2.0 / Win 10 / i9 9900 / 64gb / SSDs