diff --git a/package-lock.json b/package-lock.json
index 2d2e40b9..3e1011f4 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "cyberchef",
-  "version": "8.29.0",
+  "version": "8.29.1",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index 1e9ea3b5..d84e7d17 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "cyberchef",
-  "version": "8.29.0",
+  "version": "8.29.1",
   "description": "The Cyber Swiss Army Knife for encryption, encoding, compression and data analysis.",
   "author": "n1474335 <n1474335@gmail.com>",
   "homepage": "https://gchq.github.io/CyberChef",
diff --git a/src/core/Dish.mjs b/src/core/Dish.mjs
index 0635eb75..38247381 100755
--- a/src/core/Dish.mjs
+++ b/src/core/Dish.mjs
@@ -149,78 +149,75 @@ class Dish {
      */
     async _translate(toType, notUTF8=false) {
         log.debug(`Translating Dish from ${Dish.enumLookup(this.type)} to ${Dish.enumLookup(toType)}`);
-        const byteArrayToStr = notUTF8 ? Utils.byteArrayToChars : Utils.byteArrayToUtf8;
 
-        // Convert data to intermediate byteArray type
+        // Convert data to intermediate ArrayBuffer type
         try {
             switch (this.type) {
                 case Dish.STRING:
-                    this.value = this.value ? Utils.strToByteArray(this.value) : [];
+                    this.value = this.value ? Utils.strToArrayBuffer(this.value) : new ArrayBuffer;
                     break;
                 case Dish.NUMBER:
-                    this.value = typeof this.value === "number" ? Utils.strToByteArray(this.value.toString()) : [];
+                    this.value = typeof this.value === "number" ? Utils.strToArrayBuffer(this.value.toString()) : new ArrayBuffer;
                     break;
                 case Dish.HTML:
-                    this.value = this.value ? Utils.strToByteArray(Utils.unescapeHtml(Utils.stripHtmlTags(this.value, true))) : [];
+                    this.value = this.value ? Utils.strToArrayBuffer(Utils.unescapeHtml(Utils.stripHtmlTags(this.value, true))) : new ArrayBuffer;
                     break;
-                case Dish.ARRAY_BUFFER:
-                    // Array.from() would be nicer here, but it's slightly slower
-                    this.value = Array.prototype.slice.call(new Uint8Array(this.value));
+                case Dish.BYTE_ARRAY:
+                    this.value = new Uint8Array(this.value).buffer;
                     break;
                 case Dish.BIG_NUMBER:
-                    this.value = BigNumber.isBigNumber(this.value) ? Utils.strToByteArray(this.value.toFixed()) : [];
+                    this.value = BigNumber.isBigNumber(this.value) ? Utils.strToArrayBuffer(this.value.toFixed()) : new ArrayBuffer;
                     break;
                 case Dish.JSON:
-                    this.value = this.value ? Utils.strToByteArray(JSON.stringify(this.value, null, 4)) : [];
+                    this.value = this.value ? Utils.strToArrayBuffer(JSON.stringify(this.value, null, 4)) : new ArrayBuffer;
                     break;
                 case Dish.FILE:
-                    this.value = await Utils.readFile(this.value);
-                    this.value = Array.prototype.slice.call(this.value);
+                    this.value = (await Utils.readFile(this.value)).buffer;
                     break;
                 case Dish.LIST_FILE:
                     this.value = await Promise.all(this.value.map(async f => Utils.readFile(f)));
-                    this.value = this.value.map(b => Array.prototype.slice.call(b));
-                    this.value = [].concat.apply([], this.value);
+                    this.value = concatenateTypedArrays(...this.value).buffer;
                     break;
                 default:
                     break;
             }
         } catch (err) {
-            throw new DishError(`Error translating from ${Dish.enumLookup(this.type)} to byteArray: ${err}`);
+            throw new DishError(`Error translating from ${Dish.enumLookup(this.type)} to ArrayBuffer: ${err}`);
         }
 
-        this.type = Dish.BYTE_ARRAY;
+        this.type = Dish.ARRAY_BUFFER;
 
-        // Convert from byteArray to toType
+        // Convert from ArrayBuffer to toType
         try {
             switch (toType) {
                 case Dish.STRING:
                 case Dish.HTML:
-                    this.value = this.value ? byteArrayToStr(this.value) : "";
+                    this.value = this.value ? Utils.arrayBufferToStr(this.value, !notUTF8) : "";
                     this.type = Dish.STRING;
                     break;
                 case Dish.NUMBER:
-                    this.value = this.value ? parseFloat(byteArrayToStr(this.value)) : 0;
+                    this.value = this.value ? parseFloat(Utils.arrayBufferToStr(this.value, !notUTF8)) : 0;
                     this.type = Dish.NUMBER;
                     break;
-                case Dish.ARRAY_BUFFER:
-                    this.value = new Uint8Array(this.value).buffer;
+                case Dish.BYTE_ARRAY:
+                    this.value = Array.prototype.slice.call(new Uint8Array(this.value));
                     this.type = Dish.ARRAY_BUFFER;
                     break;
                 case Dish.BIG_NUMBER:
                     try {
-                        this.value = new BigNumber(byteArrayToStr(this.value));
+                        this.value = new BigNumber(Utils.arrayBufferToStr(this.value, !notUTF8));
                     } catch (err) {
                         this.value = new BigNumber(NaN);
                     }
                     this.type = Dish.BIG_NUMBER;
                     break;
                 case Dish.JSON:
-                    this.value = JSON.parse(byteArrayToStr(this.value));
+                    this.value = JSON.parse(Utils.arrayBufferToStr(this.value, !notUTF8));
                     this.type = Dish.JSON;
                     break;
                 case Dish.FILE:
                     this.value = new File(this.value, "unknown");
+                    this.type = Dish.FILE;
                     break;
                 case Dish.LIST_FILE:
                     this.value = [new File(this.value, "unknown")];
@@ -230,7 +227,7 @@ class Dish {
                     break;
             }
         } catch (err) {
-            throw new DishError(`Error translating from byteArray to ${Dish.enumLookup(toType)}: ${err}`);
+            throw new DishError(`Error translating from ArrayBuffer to ${Dish.enumLookup(toType)}: ${err}`);
         }
     }
 
@@ -374,6 +371,26 @@ class Dish {
 
 }
 
+/**
+ * Concatenates a list of Uint8Arrays together
+ *
+ * @param {Uint8Array[]} arrays
+ * @returns {Uint8Array}
+ */
+function concatenateTypedArrays(...arrays) {
+    let totalLength = 0;
+    for (const arr of arrays) {
+        totalLength += arr.length;
+    }
+    const result = new Uint8Array(totalLength);
+    let offset = 0;
+    for (const arr of arrays) {
+        result.set(arr, offset);
+        offset += arr.length;
+    }
+    return result;
+}
+
 
 /**
  * Dish data type enum for byte arrays.
diff --git a/src/core/Utils.mjs b/src/core/Utils.mjs
index 185100ab..59af74fb 100755
--- a/src/core/Utils.mjs
+++ b/src/core/Utils.mjs
@@ -367,6 +367,61 @@ class Utils {
     }
 
 
+    /**
+     * Converts a string to an ArrayBuffer.
+     * Treats the string as UTF-8 if any values are over 255.
+     *
+     * @param {string} str
+     * @returns {ArrayBuffer}
+     *
+     * @example
+     * // returns [72,101,108,108,111]
+     * Utils.strToArrayBuffer("Hello");
+     *
+     * // returns [228,189,160,229,165,189]
+     * Utils.strToArrayBuffer("你好");
+     */
+    static strToArrayBuffer(str) {
+        const arr = new Uint8Array(str.length);
+        let i = str.length, b;
+        while (i--) {
+            b = str.charCodeAt(i);
+            arr[i] = b;
+            // If any of the bytes are over 255, read as UTF-8
+            if (b > 255) return Utils.strToUtf8ArrayBuffer(str);
+        }
+        return arr.buffer;
+    }
+
+
+    /**
+     * Converts a string to a UTF-8 ArrayBuffer.
+     *
+     * @param {string} str
+     * @returns {ArrayBuffer}
+     *
+     * @example
+     * // returns [72,101,108,108,111]
+     * Utils.strToUtf8ArrayBuffer("Hello");
+     *
+     * // returns [228,189,160,229,165,189]
+     * Utils.strToUtf8ArrayBuffer("你好");
+     */
+    static strToUtf8ArrayBuffer(str) {
+        const utf8Str = utf8.encode(str);
+
+        if (str.length !== utf8Str.length) {
+            if (ENVIRONMENT_IS_WORKER()) {
+                self.setOption("attemptHighlight", false);
+            } else if (ENVIRONMENT_IS_WEB()) {
+                window.app.options.attemptHighlight = false;
+            }
+        }
+
+        return Utils.strToArrayBuffer(utf8Str);
+    }
+
+
     /**
      * Converts a string to a byte array.
      * Treats the string as UTF-8 if any values are over 255.
@@ -459,7 +514,7 @@ class Utils {
     /**
      * Attempts to convert a byte array to a UTF-8 string.
      *
-     * @param {byteArray} byteArray
+     * @param {byteArray|Uint8Array} byteArray
      * @returns {string}
      *
      * @example
@@ -505,6 +560,7 @@ class Utils {
     static byteArrayToChars(byteArray) {
         if (!byteArray) return "";
         let str = "";
+        // String concatenation appears to be faster than an array join
         for (let i = 0; i < byteArray.length;) {
             str += String.fromCharCode(byteArray[i++]);
         }
@@ -524,8 +580,8 @@ class Utils {
      * Utils.arrayBufferToStr(Uint8Array.from([104,101,108,108,111]).buffer);
      */
     static arrayBufferToStr(arrayBuffer, utf8=true) {
-        const byteArray = Array.prototype.slice.call(new Uint8Array(arrayBuffer));
-        return utf8 ? Utils.byteArrayToUtf8(byteArray) : Utils.byteArrayToChars(byteArray);
+        const arr = new Uint8Array(arrayBuffer);
+        return utf8 ? Utils.byteArrayToUtf8(arr) : Utils.byteArrayToChars(arr);
     }