I know what your problem is.
On the side of the properties in the pan/crop, there are a few images. At the bottom of those images you should see 2 arrows pointing up and down, if you do click it once until you get four arrows pointing in all directions.
To get rid of the 'lag' you have to disable snapping in the pan/crop, which is the icon with a little cursor and a little sparkle next to it.
I hope this helps!
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