diff --git a/CHANGELOG.md b/CHANGELOG.md
index 76fa319..5b3afa7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,7 @@ In Development
 * add support python3.15
 * The IPv6 tag of a domain literal is now case-insensitive, as in the RFCs, so `me@[ipv6:::1]` is accepted (and normalized to `me@[IPv6:::1]`) when `allow_domain_literal=True`.
 * Internationalized domains with a right-to-left label are now rejected if any other label breaks the IDNA Bidi Rule (RFC 5893), such as a label starting with a digit. Such domains, like `1.xn--4dbc.com` and `xn--4dbc.1.com` (`1.אב.com` and `אב.1.com` in Unicode), could be displayed identically.
+* Faster validation of domains without Punycode (xn--) labels.
 
 2.3.0 (August 26, 2025)
 -----------------------
diff --git a/email_validator/syntax.py b/email_validator/syntax.py
index 4e7a0be..0b116d2 100644
--- a/email_validator/syntax.py
+++ b/email_validator/syntax.py
@@ -651,6 +651,13 @@ def validate_email_domain_name(domain: str, test_environment: bool = False, glob
         if ascii_domain == d or ascii_domain.endswith("." + d):
             raise EmailSyntaxError("The part after the @-sign is a special-use or reserved name that cannot be used with email.")
 
+    # Domains without Punycode labels come back unchanged from the IDNA round trip below.
+    if "xn--" not in ascii_domain:
+        return {
+            "ascii_domain": ascii_domain,
+            "domain": ascii_domain,
+        }
+
     # We may have been given an IDNA ASCII domain to begin with. Check
     # that the domain actually conforms to IDNA. It could look like IDNA
     # but not be actual IDNA. For ASCII-only domains, the conversion out