perf: lower render scale and cloud march cap

config.js

@@ -82,14 +82,14 @@ window.CONFIG = {
     // and upscaled with image-rendering: pixelated, so it reads as pixel
     // art instead of a blurry rescale. The DOM UI stays crisp at any value.
     // 1 = native resolution (sharpest, most expensive).
-    renderScale: 0.5,             // 1 native, 0.5 pixel-art 2x, 0.25 4x
+    renderScale: 0.4,             // 1 native, 0.5 pixel-art 2x, 0.4/0.33 cheaper
     // Scene frame cap. All motion is time-based, so this only changes
     // smoothness, never speed. 0 = free running (vsync).
     maxFps: 30,                   // 0 = free running
     // MSAA on the WebGL framebuffer. Costs fill rate, and with renderScale
     // below 1 the pixel blocks dominate anyway - set false if the scene is
     // GPU bound. Read once at context creation, so a reload is needed.
-    antialias: true,              // false saves GPU fill rate
+    antialias: false,             // false saves GPU fill rate
 
     // ------------------------------------------------------------------
     // Location
@@ -340,8 +340,8 @@ window.CONFIG = {
         // cloud-deck ring without changing the actual cloud top/bottom.
         softEdges: true,
         edgeSoftness: 0.18,       // world units of vertical soft padding
-        horizonSoftness: 8.0,     // path-length fade for grazing cloud rays
+        horizonSoftness: 6.0,     // path-length fade for grazing cloud rays
-        maxMarchUnits: 120,       // raymarch cap; 30 was the old fixed cap
+        maxMarchUnits: 80,        // raymarch cap; 30 was the old fixed cap
         // softEdges: false        // old hard-edged shell behaviour
         // Terrain occlusion for clouds. false draws clouds in front of the
         // terrain mesh even when terrain is closer; true clips cloud rays