Sometime it take a few seconds for VCO lightbox to display.
In the mean time, we would like to display a loader page so consumer knows something is loading and not hit the button many times.
Also, can we disable multiple clikcking on VCO button?
I'm working to find someone from Visa Checkout to help you here. In the meantime, have you read the documents on customizing the button?
This is not something VCO supports at the moment.