diff --git a/main.js b/main.js
index 17447830..9d5f7904 100644
--- a/main.js
+++ b/main.js
@@ -2023,7 +2023,7 @@ const regenerateMap = debounce(function () {
   restoreLayers();
   if (ThreeD.options.isOn) ThreeD.redraw();
   if ($("#worldConfigurator").is(":visible")) editWorld();
-}, 500);
+}, 1000);
 
 // clear the map
 function undraw() {
diff --git a/modules/ui/heightmap-editor.js b/modules/ui/heightmap-editor.js
index 053dc477..4cac39f3 100644
--- a/modules/ui/heightmap-editor.js
+++ b/modules/ui/heightmap-editor.js
@@ -573,6 +573,7 @@ function editHeightmap() {
       document.getElementById("brushesSliders").style.display = "none";
     }
 
+    const dragBrushThrottled = throttle(dragBrush, 100);
     function toggleBrushMode(e) {
       if (e.target.classList.contains("pressed")) {
         exitBrushMode();
@@ -581,7 +582,7 @@ function editHeightmap() {
       exitBrushMode();
       document.getElementById("brushesSliders").style.display = "block";
       e.target.classList.add("pressed");
-      viewbox.style("cursor", "crosshair").call(d3.drag().on("start", dragBrush));
+      viewbox.style("cursor", "crosshair").call(d3.drag().on("start", dragBrushThrottled));
     }
 
     function dragBrush() {