FacetWP is ajax-based, so filtering happens quickly and without page refreshes. The plugin also uses an index table for extra speed.
Works with most themes
Add facets anywhere on your page using shortcodes or PHP. Other built-in features (pagination, sorting, user selections) are also just a shortcode away.
Lots of facet types
FacetWP includes many facet types, including checkboxes, dropdowns, date ranges, sliders, and even proximity (geolocation).
Developers can take advantage of the plugin’s many hooks for a high degree of customization.