Display steam bubbles with images instead of redrawing them every step, see https://github.com/phetsims/energy-forms-and-changes/issues/42
Display steam bubbles with images instead of redrawing them every step, see https://github.com/phetsims/energy-forms-and-changes/issues/42

phetsims/energy-forms-and-changes,phetsims/energy-forms-and-changes,phetsims/energy-forms-and-changes