Wacom Cintiq 21UX Pen lag when using bitmap brush in Harm Premium 12.2.1

I’m having a lag when I use the brush tool on my bitmap layer in Harmony Premium 12.2.1. I’m using a Wacom Cintiq 21 UX. I opened up Sketchbook Pro to see if I have the same issue. I don’t. I also don’t have it if I use the pencil, It’s just when I use the bitmap layer which is my under layer. Any help??? Thank you