I just found that holding the CTRL key while the mouse arrow is over the canvas and using the mouse scroll wheel lets you zoom in and out much faster. I'm glad to find this workaround... the + and - buttons are incredibly slow for me.
Is anyone else having trouble with the zoom function in the updated UI? Clicking on the + (plus) and - (minus) buttons to zoom in and out on somewhat large pipelines is very slow. I've tried in both Chrome and Edge and see the same results.