@Jason Bosco - Honestly, I could be wrong. With the litany of changes we’ve made this week (going up cluster versions, sampling facets, enabling caching), we might be on the other side of these performance concerns. It’s a multi search request in JS, and this is my options array:

[
  {
    collection: 'org-search-694',
    q: '*',
    facet_by: undefined,
    filter_by: '',
    per_page: 0,
    max_facet_values: 1000,
    group_by: undefined,
    validate_field_names: false,
    facet_sample_percent: 10,
    facet_sample_threshold: 1000,
    use_cache: true
  },
  {
    collection: 'org-search-694',
    q: '*',
    facet_by: 'customer_marketing_model_cluster_1',
    filter_by: 'customer_marketing_model_cluster_1:=[1,2,3,4,5,6,7,8,397,398]',
    per_page: 0,
    max_facet_values: 1000,
    group_by: undefined,
    validate_field_names: false,
    facet_sample_percent: 10,
    facet_sample_threshold: 1000,
    use_cache: true
  }
]