On-Page resource optimization generally has a 7-20 second impact on page loading times in China.
Fixing these not only accelerates pages for your Chinese visitors, but also enhances the overall user experience. This results in greater time-on-site, more pageviews, higher retention, and ultimately, a positive impact on your revenue.
A tiny 0.1 second delay in website load time can hurt conversion rates by 7%.
-Akamai