diff --git a/Cargo.lock b/Cargo.lock
index bf3a5c1c61233..18699b6ddeabf 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2381,6 +2381,7 @@ dependencies = [
  "itertools 0.11.0",
  "lalrpop",
  "lalrpop-util",
+ "memchr",
  "ruff_python_ast",
  "ruff_text_size",
  "rustc-hash",
diff --git a/crates/ruff_python_parser/Cargo.toml b/crates/ruff_python_parser/Cargo.toml
index a5d4208623392..46a97eabd43c5 100644
--- a/crates/ruff_python_parser/Cargo.toml
+++ b/crates/ruff_python_parser/Cargo.toml
@@ -22,6 +22,7 @@ bitflags = { workspace = true }
 is-macro = { workspace = true }
 itertools = { workspace = true }
 lalrpop-util = { version = "0.20.0", default-features = false }
+memchr = { workspace = true }
 unicode-ident = { workspace = true }
 unicode_names2 = { workspace = true }
 rustc-hash = { workspace = true }
diff --git a/crates/ruff_python_parser/src/lexer.rs b/crates/ruff_python_parser/src/lexer.rs
index 448a3e7b34681..b4f3436d5aeab 100644
--- a/crates/ruff_python_parser/src/lexer.rs
+++ b/crates/ruff_python_parser/src/lexer.rs
@@ -407,7 +407,9 @@ impl<'source> Lexer<'source> {
         #[cfg(debug_assertions)]
         debug_assert_eq!(self.cursor.previous(), '#');
 
-        self.cursor.eat_while(|c| !matches!(c, '\n' | '\r'));
+        let bytes = self.cursor.rest().as_bytes();
+        let offset = memchr::memchr2(b'\n', b'\r', bytes).unwrap_or(bytes.len());
+        self.cursor.skip_bytes(offset);
 
         Tok::Comment(self.token_text().to_string())
     }
diff --git a/crates/ruff_python_parser/src/lexer/cursor.rs b/crates/ruff_python_parser/src/lexer/cursor.rs
index c026c88e9b7fb..91c7d30c53b05 100644
--- a/crates/ruff_python_parser/src/lexer/cursor.rs
+++ b/crates/ruff_python_parser/src/lexer/cursor.rs
@@ -127,4 +127,21 @@ impl<'a> Cursor<'a> {
             self.bump();
         }
     }
+
+    /// Skips the next `count` bytes.
+    ///
+    /// ## Panics
+    ///  - If `count` is larger than the remaining bytes in the input stream.
+    ///  - If `count` indexes into a multi-byte character.
+    pub(super) fn skip_bytes(&mut self, count: usize) {
+        #[cfg(debug_assertions)]
+        {
+            self.prev_char = self.chars.as_str()[..count]
+                .chars()
+                .next_back()
+                .unwrap_or('\0');
+        }
+
+        self.chars = self.chars.as_str()[count..].chars();
+    }
 }