the simplest should be to select a diferent tab (you may note that the property tab is "highlighted" or selected in the image you posted).
Not 100% sure what you are talking about. How do you know this delay is because of the custom properties tab? Do you get the delay when you select the tab or when just opening a file? As far as I know there is no way to disable this tab. This may be an issue for your VAR.
I’ll try what you said Jeremy.
Troy, I wasn’t sure it was that for ages but slowly I’ve become convinced because it doesn’t do it until I click on that tab and the property editor that I created in Property Tab Builder loads up which takes exactly the same amount of time as the pause I’m experiencing. So Jeremy’s suggestion might just be the workaround. I’ll post back when I’ve tried this for a sufficient amount of time.