diff --git a/verify_nzb.py b/verify_nzb.py
index 953dccd..4b893b1 100644
--- a/verify_nzb.py
+++ b/verify_nzb.py
@@ -115,19 +115,29 @@ def _parse_yenc_attrs(line: bytes) -> dict[str, str]:
     return attrs
 
 
+UNESCAPED_TABLE = bytes((i - 42) % 256 for i in range(256))
+
 def _decode_yenc_lines(lines: Iterable[bytes]) -> bytes:
+    """Decodes lines of yEnc encoded data using fast byte array translations."""
     decoded = bytearray()
     for line in lines:
-        index = 0
-        while index < len(line):
-            byte = line[index]
-            if byte == 61:
-                index += 1
-                if index >= len(line):
-                    raise ValueError("dangling yEnc escape")
-                byte = (line[index] - 64) % 256
-            decoded.append((byte - 42) % 256)
-            index += 1
+        escape_pos = line.find(b"=")
+        if escape_pos == -1:
+            decoded.extend(line.translate(UNESCAPED_TABLE))
+            continue
+
+        start = 0
+        while escape_pos != -1:
+            decoded.extend(line[start:escape_pos].translate(UNESCAPED_TABLE))
+            if escape_pos + 1 >= len(line):
+                raise ValueError("dangling yEnc escape")
+            decoded.append((line[escape_pos + 1] - 106) % 256)
+            start = escape_pos + 2
+            escape_pos = line.find(b"=", start)
+
+        if start < len(line):
+            decoded.extend(line[start:].translate(UNESCAPED_TABLE))
+
     return bytes(decoded)