diff --git a/src/WispsEffect.js b/src/WispsEffect.js
index 180366f..95139c4 100644
--- a/src/WispsEffect.js
+++ b/src/WispsEffect.js
@@ -128,9 +128,9 @@ if (utils.isInShellProcess()) {
 
       const vec2  SEED            = vec2(${Math.random()}, ${Math.random()});
       const float WISPS_RADIUS    = 20.0;
-      const float WISPS_SPEED     = 15.0;
-      const float WISPS_SPACING   = 50 + WISPS_RADIUS;
-      const int   WISPS_LAYERS    = 15;
+      const float WISPS_SPEED     = 10.0;
+      const float WISPS_SPACING   = 40 + WISPS_RADIUS;
+      const int   WISPS_LAYERS    = 8;
       const float WISPS_IN_TIME   = 0.5;
       const float WINDOW_OUT_TIME = 1.0;
 
@@ -157,7 +157,7 @@ if (utils.isInShellProcess()) {
         float roundness = mix(-1.0,  1.0,   hash12(cellID*seed*7.51949));
 
         vec2 offset = vec2(sin(speed * (uTime+1)) * roundness, cos(speed * (uTime+1)));
-        offset *= (0.5 - radius / gridSize);
+        offset *= 0.5 - 0.5 * radius / gridSize;
         offset = vec2(offset.x * cos(rotation) - offset.y * sin(rotation),
                       offset.x * sin(rotation) + offset.y * cos(rotation));
 
@@ -201,7 +201,7 @@ if (utils.isInShellProcess()) {
         float windowOut = smoothstep(0, 1, clamp(uProgress/WINDOW_OUT_TIME, 0, 1));
 
         // Use a noise function to dissolve the window.
-        float noise = smoothstep(1.0, 0.0, abs(2.0 * simplex3DFractal(vec3(uv * vec2(uSizeX, uSizeY) / 250, uTime * 0.5)) - 1.0));
+        float noise = smoothstep(1.0, 0.0, abs(2.0 * simplex2DFractal(uv * vec2(uSizeX, uSizeY) / 250) - 1.0));
         float windowMask = 1.0 - (windowOut < 0.5 ? mix(0.0, noise, windowOut * 2.0) : mix(noise, 1.0, windowOut * 2.0 - 1.0));
         cogl_color_out = windowColor * windowMask * mask;