The filter, pagination, sorting, and search functions are implemented using AJAX to reload items dynamically. As a result, there may be a slight delay in displaying new items.
Optimizing the response time from your server is recommended to enhance the AJAX loading time. You can use caching plugins, such as Autoptimize or WP Super Cache because they can significantly improve performance.
Additionally, consider purchasing the Visual Portfolio Pro plugin, which offers caching and preloading features specifically designed for AJAX requests. This can further enhance the loading speed of filtering and pagination.