Robbie Richards conducted an experiment and found that the conversion rate for pop-ups that appeared on page load was 91.06 percentage points higher than that of exit-intent pop-ups. free software
It was found that conversion rates for forms that appeared within the first 10 seconds of page load were 13.11 percent higher than those that appeared 10 seconds later.
Including an image of the ebook on the form where it could be downloaded in exchange for an email address increased conversions by 110.72%.