Hello,
We have checked the “High-Performance Order Storage” functionality of the woocommerce plugin. The Ultimate Auction for Woocommerce plugin is not compatible with HPOS functionality. There is a notice displayed in woocommerce settings that “These features are either experimental or incomplete, enable them at your own risk!”. Once this functionality is completed or tested by woocommerce properly, after that we can plan to support it. So, currently, the Ultimate Auction for Woocommerce plugin is not compatible with it.
The task of supporting HPOS is high-level and time-consuming. So, it is not near the update timeline until this feature is completed and tested by woocommerce.
Thank You
