diff --git a/aws_bedrock_utilities/models/base.py b/aws_bedrock_utilities/models/base.py
index 69a3a15..48fd2b0 100644
--- a/aws_bedrock_utilities/models/base.py
+++ b/aws_bedrock_utilities/models/base.py
@@ -48,6 +48,7 @@
 from langchain.agents import Tool
 from langchain.chains import RetrievalQA
 from langchain_aws import ChatBedrock
+import functools
 from langchain_community.document_loaders import PyPDFLoader
 from langchain_text_splitters import CharacterTextSplitter
 from pydantic import BaseModel, Field
@@ -162,6 +163,7 @@ def get_models_args(self, model: str):
         logging.warning(f"Model args not found for {model}")
         return {}
 
+    @functools.cache
     def get_llm(self, model_id: str):
         args = self.get_models_args(model_id)
         llm = ChatBedrock(
diff --git a/aws_bedrock_utilities/models/bedrock_chat.py b/aws_bedrock_utilities/models/bedrock_chat.py
index 72620c1..fcf050e 100644
--- a/aws_bedrock_utilities/models/bedrock_chat.py
+++ b/aws_bedrock_utilities/models/bedrock_chat.py
@@ -74,7 +74,7 @@ def run_chat(
             prompt=prompt,
             llm=self.get_llm(model_id=model_id),
             verbose=True,
-            # memory=memory,
+            memory=ConversationBufferMemory(ai_prefix="AI Assistant"),
         )
 
         answer = conversation.invoke(query)
diff --git a/aws_bedrock_utilities/models/pgvector_knowledgebase.py b/aws_bedrock_utilities/models/pgvector_knowledgebase.py
index 93f71ba..987b0a5 100644
--- a/aws_bedrock_utilities/models/pgvector_knowledgebase.py
+++ b/aws_bedrock_utilities/models/pgvector_knowledgebase.py
@@ -36,6 +36,7 @@
     UnstructuredXMLLoader,
     UnstructuredRSTLoader,
     UnstructuredExcelLoader,
+    UnstructuredPowerPointLoader,
     DataFrameLoader,
 )
 import logging
@@ -167,6 +168,8 @@ def get_loader(filepath: str) -> Dict[str, Any]:
         loader = UnstructuredEPubLoader(filepath)
     elif file_ext in ["doc", "docx"]:
         loader = Docx2txtLoader(filepath)
+    elif file_ext == 'pptx':
+        loader = UnstructuredPowerPointLoader(filepath, mode="elements")
     elif file_ext in ["xls", "xlsx"]:
         loader = UnstructuredExcelLoader(filepath)
     elif file_ext == "json":