diff --git a/src/deepgram/core/client_wrapper.py b/src/deepgram/core/client_wrapper.py
index 1db0612d..7ccd1231 100644
--- a/src/deepgram/core/client_wrapper.py
+++ b/src/deepgram/core/client_wrapper.py
@@ -26,7 +26,7 @@ def get_headers(self) -> typing.Dict[str, str]:
             "X-Fern-Language": "Python",
             "X-Fern-SDK-Name": "deepgram",
             # x-release-please-start-version
-            "X-Fern-SDK-Version": "5.2.0", 
+            "X-Fern-SDK-Version": "5.2.0",
             # x-release-please-end
             **(self.get_custom_headers() or {}),
         }
diff --git a/src/deepgram/core/jsonable_encoder.py b/src/deepgram/core/jsonable_encoder.py
index afee3662..69dc779a 100644
--- a/src/deepgram/core/jsonable_encoder.py
+++ b/src/deepgram/core/jsonable_encoder.py
@@ -30,13 +30,26 @@
 
 def jsonable_encoder(obj: Any, custom_encoder: Optional[Dict[Any, Callable[[Any], Any]]] = None) -> Any:
     custom_encoder = custom_encoder or {}
+    # Short-circuit most common types (early returns improve performance)
+    if isinstance(obj, (str, int, float, type(None))):
+        return obj
+    if isinstance(obj, bytes):
+        return base64.b64encode(obj).decode("utf-8")
+    if isinstance(obj, Enum):
+        return obj.value
+    if isinstance(obj, PurePath):
+        return str(obj)
+    if isinstance(obj, dt.datetime):
+        return serialize_datetime(obj)
+    if isinstance(obj, dt.date):
+        return str(obj)
     if custom_encoder:
-        if type(obj) in custom_encoder:
-            return custom_encoder[type(obj)](obj)
-        else:
-            for encoder_type, encoder_instance in custom_encoder.items():
-                if isinstance(obj, encoder_type):
-                    return encoder_instance(obj)
+        obj_type = type(obj)
+        if obj_type in custom_encoder:
+            return custom_encoder[obj_type](obj)
+        for encoder_type, encoder_instance in custom_encoder.items():
+            if isinstance(obj, encoder_type):
+                return encoder_instance(obj)
     if isinstance(obj, pydantic.BaseModel):
         if IS_PYDANTIC_V2:
             encoder = getattr(obj.model_config, "json_encoders", {})  # type: ignore # Pydantic v2
@@ -45,6 +58,7 @@ def jsonable_encoder(obj: Any, custom_encoder: Optional[Dict[Any, Callable[[Any]
         if custom_encoder:
             encoder.update(custom_encoder)
         obj_dict = obj.dict(by_alias=True)
+        # Collapse single-root models quickly
         if "__root__" in obj_dict:
             obj_dict = obj_dict["__root__"]
         if "root" in obj_dict:
@@ -53,32 +67,27 @@ def jsonable_encoder(obj: Any, custom_encoder: Optional[Dict[Any, Callable[[Any]
     if dataclasses.is_dataclass(obj):
         obj_dict = dataclasses.asdict(obj)  # type: ignore
         return jsonable_encoder(obj_dict, custom_encoder=custom_encoder)
-    if isinstance(obj, bytes):
-        return base64.b64encode(obj).decode("utf-8")
-    if isinstance(obj, Enum):
-        return obj.value
-    if isinstance(obj, PurePath):
-        return str(obj)
-    if isinstance(obj, (str, int, float, type(None))):
-        return obj
-    if isinstance(obj, dt.datetime):
-        return serialize_datetime(obj)
-    if isinstance(obj, dt.date):
-        return str(obj)
     if isinstance(obj, dict):
-        encoded_dict = {}
-        allowed_keys = set(obj.keys())
-        for key, value in obj.items():
-            if key in allowed_keys:
-                encoded_key = jsonable_encoder(key, custom_encoder=custom_encoder)
-                encoded_value = jsonable_encoder(value, custom_encoder=custom_encoder)
-                encoded_dict[encoded_key] = encoded_value
-        return encoded_dict
+        # More efficient: use comprehension to avoid explicit allowed_keys/set logic
+        return {
+            jsonable_encoder(k, custom_encoder=custom_encoder): jsonable_encoder(v, custom_encoder=custom_encoder)
+            for k, v in obj.items()
+        }
     if isinstance(obj, (list, set, frozenset, GeneratorType, tuple)):
-        encoded_list = []
-        for item in obj:
-            encoded_list.append(jsonable_encoder(item, custom_encoder=custom_encoder))
-        return encoded_list
+        # Use generator expression with appropriate constructor, faster than append-hit loop
+        typ = type(obj)
+        # Maintain original type for tuple/list; sets frozenset supported
+        if typ is tuple:
+            return tuple(jsonable_encoder(item, custom_encoder=custom_encoder) for item in obj)
+        elif typ is list:
+            return [jsonable_encoder(item, custom_encoder=custom_encoder) for item in obj]
+        elif typ is set:
+            return {jsonable_encoder(item, custom_encoder=custom_encoder) for item in obj}
+        elif typ is frozenset:
+            return frozenset(jsonable_encoder(item, custom_encoder=custom_encoder) for item in obj)
+        else:
+            # for generators
+            return [jsonable_encoder(item, custom_encoder=custom_encoder) for item in obj]
 
     def fallback_serializer(o: Any) -> Any:
         attempt_encode = encode_by_type(o)
@@ -92,9 +101,9 @@ def fallback_serializer(o: Any) -> Any:
             errors.append(e)
             try:
                 data = vars(o)
-            except Exception as e:
-                errors.append(e)
-                raise ValueError(errors) from e
+            except Exception as e2:
+                errors.append(e2)
+                raise ValueError(errors) from e2
         return jsonable_encoder(data, custom_encoder=custom_encoder)
 
     return to_jsonable_with_fallback(obj, fallback_serializer)