Steve,
A "wee bit" faster? The scroller moved so fast that the letters were a blur.... My monitor almost got "rug burn"....
And all I changed was this segment:
'CIRCLE (x * t2 + t1, y * t2 + t1), LEDs.size, tc
'PAINT (x * t2 + t1, y * t2 + t1), tc, tc
CircleFill x * t2 + t1, y * t2 + t1, LEDs.size, tc
CIRCLE/PAINT is sloooooow. Swapping it with a good CircleFill routine was all the code needed to eliminate the lag. ;)