1. For performance reasons, by default, the editor displays graphics on the screen in “High” quality. In the “Canvas” pane in the “Project settings” panel, you can change this setting. For a better quality when viewing the canvas in a small size, choose the “Best” option in the quality dropdownbox. The quality setting will not affect the quality of saved images nor the quality of images displayed on merchandise.
2. The editor performance will degrade with time, so when it starts to feel a little slow and unresponsive, save the project and refresh the internet browser. The unresponsiveness becomes annoying specially when doing actions that require a keyboard key to be pressed during the action. A browser refresh should help on this issues.