Is it possible to enable extended preloading in Safari, similar to what’s available in Chrome?

Google Chrome and other Chromium-based browsers become significantly faster when Extended Preloading is enabled in the settings. I know Safari has basic preloading, like for top hit results, but are there any flags or settings to make it as robust as Chrome? And in case there are, does preloading work with Private Relay enabled, or does it need to be turned off for preloading to function properly?