[Inf-IT DAVcl] CalDAVmate slow popup for add entry

Hi, In one of my workspaces I permanently have google-chrome (linux) with CalDAVmate. When I try to add an appointment by doubleclicking on the calendar, it can take up to 10 seconds before the popup appears. When I click on the [add entry] button it appears almost immediately. Any ideas what could cause this delay? -- Johan