Why PyGen generated SDK lags in performance when compared to query method in cognite sdk ?

We have generated a SDK using pygen on our Model. 
Post that we requested a data from particular view in below eg - Property_type. It contains ~138k reocrds

Observe the below results on time taken to fetch via

1. Cognite SDK - 44 secs
2. Pygen SDK - 82 secs

Its fetching the same data from the same cognite project, but still seeing the performance lag. Its taking almost double time. Both numbers are from my local sandbox.

1. Cognite SDK Code

   config = {
       "client_name": "abcd",
       "project": "slb-odf-qa",
       "base_url": "https://westeurope-1.cognitedata.com/",
       "credentials": {
           "client_credentials": {
               "client_id": "e063088ad3b4548d4911bd4a617990aa",
               "client_secret": "",
               "token_url": "https://p4d.csi.cloud.slb-ds.com/v2/token",
               "scopes": ["9237c91ce1ea434fa5a91262a5ea3646"],
           },
       },
   }
   cognite_client = CogniteClient.load(config)
   
   view_id_1 = ViewId(space="slb-pdm-dm-governed", external_id="PropertyType",version="1_6")
   
   def _get_timeseries():
       next_cursor = None  # Initialize the cursor as None at first
       all_data = []  # List to hold all results
       while True:
           # Construct the query with the current cursor
           query = Query(
               with_={
                   "PropertyType": NodeResultSetExpression(
                       limit=10000,
                       filter=HasData(views=[view_id_1])
                   )
               },
               select={"PropertyType": Select([SourceSelector(view_id_1, properties=['*'])])},
               cursors={"PropertyType": next_cursor}  
           )
   
           result = cognite_client.data_modeling.instances.query(query)
   
           if "PropertyType" in result.data:
               all_data.extend(result.data["PropertyType"])  
           next_cursor = result.cursors.get("PropertyType", None)
   
           if not next_cursor:
               return all_data
   
   start_time = time.time()
   data = _get_timeseries()
   end_time = time.time()
   print(len(data))
   print(end_time - start_time)
   
   ##Output
   # 138205
   # 82.43460583686829

    

2. Pygen SDK

   config = {
       "client_name": "abcd",
       "project": "slb-odf-qa",
       "base_url": "https://westeurope-1.cognitedata.com/",
       "credentials": {
           "client_credentials": {
               "client_id": "e063088ad3b4548d4911bd4a617990aa",
               "client_secret": "",
               "token_url": "https://p4d.csi.cloud.slb-ds.com/v2/token",
               "scopes": ["9237c91ce1ea434fa5a91262a5ea3646"],
           },
       },
   }
   client = CogniteClient.load(config)
   
   from my_domain.client import MyClient
   pygen_client = MyClient(client)
   
   def _get_property():
       return pygen_client.property_type.list(limit=None, retrieve_connections='skip')
   
   start_time = time.time()
   data = _get_property()
   end_time = time.time()
   
   print(len(data))
   print(end_time - start_time)
   
   ##Output
   # 138205
   # 82.43460583686829

Looks like an issue in the pygen sdk. Can this be looked into.