Add comment/warning.

1 files changed, 1 insertions, 0 deletions

diff --git a/main.js b/main.js
index 52d27da..ec09863 100644
--- a/main.js
+++ b/main.js
@@ -4545,6 +4545,7 @@ const [mapLayers, featureOverlayLayer] = (function() {
       declutter: false,
       visible: isVisible(k),
       style: function(feature, resolution) {
+        /* WARN: very hot code path! */
         const properties = feature.getProperties();
         if (age_filter_settings.active) {
           /* TODO avoid doing this checks for each feature; instead, set up a