diff --git a/src/gpu/effects/GrConvolutionEffect.cpp b/src/gpu/effects/GrConvolutionEffect.cpp
index 1fb2e9598f..4f09138493 100644
--- a/src/gpu/effects/GrConvolutionEffect.cpp
+++ b/src/gpu/effects/GrConvolutionEffect.cpp
@@ -46,9 +46,12 @@ void GrGLConvolutionEffect::emitCode(EmitArgs& args) {
 
     int width = Gr1DKernelEffect::WidthFromRadius(ce.radius());
 
+    int arrayCount = (width + 3) / 4;
+    SkASSERT(4 * arrayCount >= width);
+
     fKernelUni = uniformHandler->addUniformArray(kFragment_GrShaderFlag,
-                                                 kFloat_GrSLType, kDefault_GrSLPrecision,
-                                                 "Kernel", width);
+                                                 kVec4f_GrSLType, kDefault_GrSLPrecision,
+                                                 "Kernel", arrayCount);
 
     GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
     SkString coords2D = fragBuilder->ensureFSCoords2D(args.fCoords, 0);
@@ -61,11 +64,13 @@ void GrGLConvolutionEffect::emitCode(EmitArgs& args) {
     fragBuilder->codeAppendf("vec2 coord = %s - %d.0 * %s;", coords2D.c_str(), ce.radius(), imgInc);
 
     // Manually unroll loop because some drivers don't; yields 20-30% speedup.
+    const char* kVecSuffix[4] = { ".x", ".y", ".z", ".w" };
     for (int i = 0; i < width; i++) {
         SkString index;
         SkString kernelIndex;
-        index.appendS32(i);
+        index.appendS32(i/4);
         kernel.appendArrayAccess(index.c_str(), &kernelIndex);
+        kernelIndex.append(kVecSuffix[i & 0x3]);
 
         if (ce.useBounds()) {
             // We used to compute a bool indicating whether we're in bounds or not, cast it to a
@@ -119,7 +124,9 @@ void GrGLConvolutionEffect::onSetData(const GrGLSLProgramDataManager& pdman,
     }
     int width = Gr1DKernelEffect::WidthFromRadius(conv.radius());
 
-    pdman.set1fv(fKernelUni, width, conv.kernel());
+    int arrayCount = (width + 3) / 4;
+    SkASSERT(4 * arrayCount >= width);
+    pdman.set4fv(fKernelUni, arrayCount, conv.kernel());
 }
 
 void GrGLConvolutionEffect::GenKey(const GrProcessor& processor, const GrGLSLCaps&,
diff --git a/src/gpu/effects/GrMatrixConvolutionEffect.cpp b/src/gpu/effects/GrMatrixConvolutionEffect.cpp
index e25cd22b4a..ea3301fb3f 100644
--- a/src/gpu/effects/GrMatrixConvolutionEffect.cpp
+++ b/src/gpu/effects/GrMatrixConvolutionEffect.cpp
@@ -39,14 +39,17 @@ void GrGLMatrixConvolutionEffect::emitCode(EmitArgs& args) {
     int kWidth = mce.kernelSize().width();
     int kHeight = mce.kernelSize().height();
 
+    int arrayCount = (kWidth + 3) / 4;
+    SkASSERT(4 * arrayCount >= kWidth);
+
     GrGLSLUniformHandler* uniformHandler = args.fUniformHandler;
     fImageIncrementUni = uniformHandler->addUniform(kFragment_GrShaderFlag,
                                                     kVec2f_GrSLType, kDefault_GrSLPrecision,
                                                     "ImageIncrement");
     fKernelUni = uniformHandler->addUniformArray(kFragment_GrShaderFlag,
-                                                 kFloat_GrSLType, kDefault_GrSLPrecision,
+                                                 kVec4f_GrSLType, kDefault_GrSLPrecision,
                                                  "Kernel",
-                                                 kWidth * kHeight);
+                                                 arrayCount);
     fKernelOffsetUni = uniformHandler->addUniform(kFragment_GrShaderFlag,
                                                   kVec2f_GrSLType, kDefault_GrSLPrecision,
                                                   "KernelOffset");
@@ -67,10 +70,14 @@ void GrGLMatrixConvolutionEffect::emitCode(EmitArgs& args) {
     fragBuilder->codeAppendf("vec2 coord = %s - %s * %s;", coords2D.c_str(), kernelOffset, imgInc);
     fragBuilder->codeAppend("vec4 c;");
 
+    const char* kVecSuffix[4] = { ".x", ".y", ".z", ".w" };
     for (int y = 0; y < kHeight; y++) {
         for (int x = 0; x < kWidth; x++) {
             GrGLSLShaderBuilder::ShaderBlock block(fragBuilder);
-            fragBuilder->codeAppendf("float k = %s[%d * %d + %d];", kernel, y, kWidth, x);
+            int offset = y*kWidth + x;
+
+            fragBuilder->codeAppendf("float k = %s[%d]%s;", kernel, offset / 4, 
+                                     kVecSuffix[offset & 0x3]);
             SkString coord;
             coord.printf("coord + vec2(%d, %d) * %s", x, y, imgInc);
             fDomain.sampleTexture(fragBuilder,
@@ -130,7 +137,10 @@ void GrGLMatrixConvolutionEffect::onSetData(const GrGLSLProgramDataManager& pdma
     imageIncrement[1] = ySign / texture.height();
     pdman.set2fv(fImageIncrementUni, 1, imageIncrement);
     pdman.set2fv(fKernelOffsetUni, 1, conv.kernelOffset());
-    pdman.set1fv(fKernelUni, conv.kernelSize().width() * conv.kernelSize().height(), conv.kernel());
+    int kernelCount = conv.kernelSize().width() * conv.kernelSize().height();
+    int arrayCount = (kernelCount + 3) / 4;
+    SkASSERT(4 * arrayCount >= kernelCount);
+    pdman.set4fv(fKernelUni, arrayCount, conv.kernel());
     pdman.set1f(fGainUni, conv.gain());
     pdman.set1f(fBiasUni, conv.bias());
     fDomain.setData(pdman, conv.domain(), texture.origin());