diff --git a/bower.json b/bower.json
index d085ba13b..8952dd793 100644
--- a/bower.json
+++ b/bower.json
@@ -1,6 +1,6 @@
 {
   "name": "pdfjs-dist",
-  "version": "1.0.610",
+  "version": "1.0.612",
   "keywords": [
     "Mozilla",
     "pdf",
diff --git a/build/pdf.combined.js b/build/pdf.combined.js
index 9194eb5f7..288a2c15b 100644
--- a/build/pdf.combined.js
+++ b/build/pdf.combined.js
@@ -22,8 +22,8 @@ if (typeof PDFJS === 'undefined') {
   (typeof window !== 'undefined' ? window : this).PDFJS = {};
 }
 
-PDFJS.version = '1.0.610';
-PDFJS.build = '3dce05f';
+PDFJS.version = '1.0.612';
+PDFJS.build = '669a4d1';
 
 (function pdfjsWrapper() {
   // Use strict in our context only - users might not want it
@@ -41069,6 +41069,42 @@ var Jbig2Image = (function Jbig2ImageClosure() {
     0x0008  // '0000' + '001000'
   ];
 
+  function decodeBitmapTemplate0(width, height, decodingContext) {
+    var decoder = decodingContext.decoder;
+    var contexts = decodingContext.contextCache.getContexts('GB');
+    var contextLabel, i, j, pixel, row, row1, row2, bitmap = [];
+
+    // ...ooooo....
+    // ..ooooooo... Context template for current pixel (X)
+    // .ooooX...... (concatenate values of 'o'-pixels to get contextLabel)
+    var OLD_PIXEL_MASK = 0x7BF7; // 01111 0111111 0111
+
+    for (i = 0; i < height; i++) {
+      row = bitmap[i] = new Uint8Array(width);
+      row1 = (i < 1) ? row : bitmap[i - 1];
+      row2 = (i < 2) ? row : bitmap[i - 2];
+
+      // At the beginning of each row:
+      // Fill contextLabel with pixels that are above/right of (X)
+      contextLabel = (row2[0] << 13) | (row2[1] << 12) | (row2[2] << 11) |
+                     (row1[0] << 7) | (row1[1] << 6) | (row1[2] << 5) |
+                     (row1[3] << 4);
+
+      for (j = 0; j < width; j++) {
+        row[j] = pixel = decoder.readBit(contexts, contextLabel);
+
+        // At each pixel: Clear contextLabel pixels that are shifted
+        // out of the context, then add new ones.
+        // If j + n is out of range at the right image border, then
+        // the undefined value of bitmap[i - 2][j + n] is shifted to 0
+        contextLabel = ((contextLabel & OLD_PIXEL_MASK) << 1) |
+                       (row2[j + 3] << 11) | (row1[j + 4] << 4) | pixel;
+      }
+    }
+
+    return bitmap;
+  }
+
   // 6.2 Generic Region Decoding Procedure
   function decodeBitmap(mmr, width, height, templateIndex, prediction, skip, at,
                         decodingContext) {
@@ -41076,6 +41112,13 @@ var Jbig2Image = (function Jbig2ImageClosure() {
       error('JBIG2 error: MMR encoding is not supported');
     }
 
+    // Use optimized version for the most common case
+    if (templateIndex === 0 && !skip && !prediction && at.length === 4 &&
+        at[0].x === 3 && at[0].y === -1 && at[1].x === -3 && at[1].y === -1 &&
+        at[2].x === 2 && at[2].y === -2 && at[3].x === -2 && at[3].y === -2) {
+      return decodeBitmapTemplate0(width, height, decodingContext);
+    }
+
     var useskip = !!skip;
     var template = CodingTemplates[templateIndex].concat(at);
 
diff --git a/build/pdf.js b/build/pdf.js
index 2de1e1422..7d1e89eb3 100644
--- a/build/pdf.js
+++ b/build/pdf.js
@@ -22,8 +22,8 @@ if (typeof PDFJS === 'undefined') {
   (typeof window !== 'undefined' ? window : this).PDFJS = {};
 }
 
-PDFJS.version = '1.0.610';
-PDFJS.build = '3dce05f';
+PDFJS.version = '1.0.612';
+PDFJS.build = '669a4d1';
 
 (function pdfjsWrapper() {
   // Use strict in our context only - users might not want it
diff --git a/build/pdf.worker.js b/build/pdf.worker.js
index 66689ce55..1fa43bf76 100644
--- a/build/pdf.worker.js
+++ b/build/pdf.worker.js
@@ -22,8 +22,8 @@ if (typeof PDFJS === 'undefined') {
   (typeof window !== 'undefined' ? window : this).PDFJS = {};
 }
 
-PDFJS.version = '1.0.610';
-PDFJS.build = '3dce05f';
+PDFJS.version = '1.0.612';
+PDFJS.build = '669a4d1';
 
 (function pdfjsWrapper() {
   // Use strict in our context only - users might not want it
@@ -36212,6 +36212,42 @@ var Jbig2Image = (function Jbig2ImageClosure() {
     0x0008  // '0000' + '001000'
   ];
 
+  function decodeBitmapTemplate0(width, height, decodingContext) {
+    var decoder = decodingContext.decoder;
+    var contexts = decodingContext.contextCache.getContexts('GB');
+    var contextLabel, i, j, pixel, row, row1, row2, bitmap = [];
+
+    // ...ooooo....
+    // ..ooooooo... Context template for current pixel (X)
+    // .ooooX...... (concatenate values of 'o'-pixels to get contextLabel)
+    var OLD_PIXEL_MASK = 0x7BF7; // 01111 0111111 0111
+
+    for (i = 0; i < height; i++) {
+      row = bitmap[i] = new Uint8Array(width);
+      row1 = (i < 1) ? row : bitmap[i - 1];
+      row2 = (i < 2) ? row : bitmap[i - 2];
+
+      // At the beginning of each row:
+      // Fill contextLabel with pixels that are above/right of (X)
+      contextLabel = (row2[0] << 13) | (row2[1] << 12) | (row2[2] << 11) |
+                     (row1[0] << 7) | (row1[1] << 6) | (row1[2] << 5) |
+                     (row1[3] << 4);
+
+      for (j = 0; j < width; j++) {
+        row[j] = pixel = decoder.readBit(contexts, contextLabel);
+
+        // At each pixel: Clear contextLabel pixels that are shifted
+        // out of the context, then add new ones.
+        // If j + n is out of range at the right image border, then
+        // the undefined value of bitmap[i - 2][j + n] is shifted to 0
+        contextLabel = ((contextLabel & OLD_PIXEL_MASK) << 1) |
+                       (row2[j + 3] << 11) | (row1[j + 4] << 4) | pixel;
+      }
+    }
+
+    return bitmap;
+  }
+
   // 6.2 Generic Region Decoding Procedure
   function decodeBitmap(mmr, width, height, templateIndex, prediction, skip, at,
                         decodingContext) {
@@ -36219,6 +36255,13 @@ var Jbig2Image = (function Jbig2ImageClosure() {
       error('JBIG2 error: MMR encoding is not supported');
     }
 
+    // Use optimized version for the most common case
+    if (templateIndex === 0 && !skip && !prediction && at.length === 4 &&
+        at[0].x === 3 && at[0].y === -1 && at[1].x === -3 && at[1].y === -1 &&
+        at[2].x === 2 && at[2].y === -2 && at[3].x === -2 && at[3].y === -2) {
+      return decodeBitmapTemplate0(width, height, decodingContext);
+    }
+
     var useskip = !!skip;
     var template = CodingTemplates[templateIndex].concat(at);
 
diff --git a/package.json b/package.json
index ccdb847c8..b41cc1207 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "pdfjs-dist",
-  "version": "1.0.610",
+  "version": "1.0.612",
   "description": "Generic build of Mozilla's PDF.js library.",
   "keywords": [
     "Mozilla",