diff --git a/lib/byte-utils.js b/lib/byte-utils.js
index be84255..4f0dc25 100644
--- a/lib/byte-utils.js
+++ b/lib/byte-utils.js
@@ -33,13 +33,19 @@ export function asU8A (buf) {
   return isBuffer(buf) ? new Uint8Array(buf.buffer, buf.byteOffset, buf.byteLength) : buf
 }
 
+// Threshold for manual UTF-8 encoding vs native methods.
+// Node.js Buffer.from: crossover ~24 chars
+// Browser TextEncoder: crossover ~200 chars
+const FROM_STRING_THRESHOLD_BUFFER = 24
+const FROM_STRING_THRESHOLD_TEXTENCODER = 200
+
 export const fromString = useBuffer
   ? // eslint-disable-line operator-linebreak
     /**
      * @param {string} string
      */
     (string) => {
-      return string.length > 64
+      return string.length >= FROM_STRING_THRESHOLD_BUFFER
         ? // eslint-disable-line operator-linebreak
       // @ts-ignore
         globalThis.Buffer.from(string)
@@ -51,7 +57,7 @@ export const fromString = useBuffer
      * @param {string} string
      */
     (string) => {
-      return string.length > 64 ? textEncoder.encode(string) : utf8ToBytes(string)
+      return string.length >= FROM_STRING_THRESHOLD_TEXTENCODER ? textEncoder.encode(string) : utf8ToBytes(string)
     }
 
 /**