How to refresh the composite editor or make it less laggy?

Hi folks,

Just getting into the compositor.

Quick question: the compositor seems a bit laggy in terms of display. Sometimes it won’t show a change until you disconnect then reconnect a node. Especially the image shown in the render layer node is often out of date. Are there any tricks (hotkeys?) to refresh the nodes view or other ways to make it update quicker?

I’m used to DaVinci Fusion which is a lot snappier and doesn’t have any lag!