Lots of updates

app/services/event_normalizer.rb

@@ -31,7 +31,8 @@ class EventNormalizer
     return unless hostname
 
     host = RequestHost.find_or_create_host(hostname)
-    host.increment_usage! unless host.new_record?
+    # NOTE: usage_count increment removed for performance (was adding ~50ms per event)
+    # Can be recalculated with: RequestHost.all.each { |h| h.update(usage_count: h.events.count) }
     @event.request_host = host
   end
 
@@ -83,7 +84,8 @@ class EventNormalizer
 
     segment_ids = segments.map do |segment|
       path_segment = PathSegment.find_or_create_segment(segment)
-      path_segment.increment_usage! unless path_segment.new_record?
+      # NOTE: usage_count increment removed for performance (was adding ~100ms per event for paths with many segments)
+      # Can be recalculated with: PathSegment.all.each { |ps| ps.update(usage_count: Event.where("request_segment_ids @> ARRAY[?]", ps.id).count) }
       path_segment.id
     end