Storyboard running incredibly slowly, near impossible to use

I have a project, about two minutes long. It is almost entirely vector layers, but I am now adding bitmap layers and was hoping to add them to each panel for colour and background. However, storyboard began to run very slowly. Brush strokes were late, scrubbing the timeline was slow, and the program often becomes unresponsive. I really need to work on this project, so any help would be appreciated. Should I draw in a different program and import the images? Should I get more memory? I am using Windows 10 and the most recent version of Storyboard. Thanks!

I figured out a solution, I converted finished bitmap layers to vector layers.