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The slowdown is caused by too many overlays. The ideal solution would be to bake all layers on just one overlay. That will take some time to adjust...
one thing i notice is the track title header on the lyrics overlaps with the top of the lyrics text.Its also the case for the artist biography but the overlap seems smaller
Probably the easiest solution would be to add fg and fg2(mouseover) attributes to the two autoHide panels since you already allowed pinning for those panels.
"mouseOverFg" should be "fg2", then it will work.