Spatial Intersect Very Slow For Large Polygon and Large Index

Hi all, I have indexed the entire geonames points (lat/long) with JTS enabled, and I am trying return all points (geonameids) within a certain polygon (e.g. Netherlands country polygon). This query takes 3 minutes to return only 10.000 points. I am using only solr intersect. no facets. no extra fitering.

Is there any configuration that could slow down such a query to less than 300 ms?