diff --git a/app/lib/error-reporting.ts b/app/lib/error-reporting.ts
index c81aa4a..e7fa9d6 100644
--- a/app/lib/error-reporting.ts
+++ b/app/lib/error-reporting.ts
@@ -24,8 +24,14 @@ function sanitizeError(data: Error, seen: WeakSet<object>): Error {
 
 function sanitizeObject(data: Record<string, unknown>, seen: WeakSet<object>): Record<string, unknown> {
   const sanitizedObj: Record<string, unknown> = {};
-  for (const [key, value] of Object.entries(data)) {
-    sanitizedObj[key] = SENSITIVE_KEY_PATTERN.test(key) ? "[REDACTED]" : sanitize(value, seen);
+  // Performance optimization: Use for...in with Object.hasOwn to avoid intermediate
+  // [key, value] tuple array allocations created by Object.entries(data).
+  for (const key in data) {
+    if (Object.hasOwn(data, key)) {
+      sanitizedObj[key] = SENSITIVE_KEY_PATTERN.test(key)
+        ? "[REDACTED]"
+        : sanitize(data[key], seen);
+    }
   }
   return sanitizedObj;
 }