Is there a Scroll.Speed Variable ?

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There is no scroll speed control built in but you could use every so many seconds to control how fast the scroll happens.

You would need to use scroll to object or position and then use a decreasing variable to set the scroll X and Y to that position with an every so many seconds decrease distance between scroll X and Y and position of object.

Sounds like a hassle but it could be done.

That's a good idea - thanks !

A simple way to make customizable smooth scrolling is to have an invisible sprite with the scroll to behaviour and rex move to behaviour. And then you set that object to follow your character and set the speed to whatever you want and you'll then have perfect smooth scrolling with almost no extra work

very nice one !