Recently, there has been an influx of data showing that sites improving the site performance saw a lift in conversion.
For example, an in-house Walmart.com study found that, for every one second of load time improvement, the site experienced up to a 2% increase in conversions. For every 100 milliseconds of improvement, incremental revenues grew by up to 1%. And in another study about the impact of page delay on ecommerce metrics, Radware, found that a mere one-second HTML delay resulted in the following penalties for an ecommerce client:
3.5% decrease in conversion rate, 2.1% drop in cart size, 9.4% fewer page views, and 8.3% increase in bounce rate.
Our e-commerce site is largely dependent on our product imagery and promotional content. Creative understands these metrics, but also is hesitant to over compress an image.
Have there been any studies on where the point of diminishing returns is on image compression? At what point does image compression stop having a positive impact on user experience, and become neutral or negative?