diff --git a/mem0/memory/utils.py b/mem0/memory/utils.py
index 8c11705c87..e6c29b8007 100644
--- a/mem0/memory/utils.py
+++ b/mem0/memory/utils.py
@@ -7,14 +7,63 @@
     AGENT_MEMORY_EXTRACTION_PROMPT,
 )
 
+_char_map = {
+    "...": "_ellipsis_",
+    "…": "_ellipsis_",
+    "。": "_period_",
+    "，": "_comma_",
+    "；": "_semicolon_",
+    "：": "_colon_",
+    "！": "_exclamation_",
+    "？": "_question_",
+    "（": "_lparen_",
+    "）": "_rparen_",
+    "【": "_lbracket_",
+    "】": "_rbracket_",
+    "《": "_langle_",
+    "》": "_rangle_",
+    "'": "_apostrophe_",
+    '"': "_quote_",
+    "\\": "_backslash_",
+    "/": "_slash_",
+    "|": "_pipe_",
+    "&": "_ampersand_",
+    "=": "_equals_",
+    "+": "_plus_",
+    "*": "_asterisk_",
+    "^": "_caret_",
+    "%": "_percent_",
+    "$": "_dollar_",
+    "#": "_hash_",
+    "@": "_at_",
+    "!": "_bang_",
+    "?": "_question_",
+    "(": "_lparen_",
+    ")": "_rparen_",
+    "[": "_lbracket_",
+    "]": "_rbracket_",
+    "{": "_lbrace_",
+    "}": "_rbrace_",
+    "<": "_langle_",
+    ">": "_rangle_",
+}
+
+_multi_keys = [k for k in _char_map if len(k) > 1]
+
+_single_keys = [k for k in _char_map if len(k) == 1]
+
+_translation_table = str.maketrans({k: v for k, v in _char_map.items() if len(k) == 1})
+
+_re_sub_underscores = re.compile(r"_+")
+
 
 def get_fact_retrieval_messages(message, is_agent_memory=False):
     """Get fact retrieval messages based on the memory type.
-    
+
     Args:
         message: The message content to extract facts from
         is_agent_memory: If True, use agent memory extraction prompt, else use user memory extraction prompt
-        
+
     Returns:
         tuple: (system_prompt, user_prompt)
     """
@@ -64,11 +113,10 @@ def remove_code_blocks(content: str) -> str:
     """
     pattern = r"^```[a-zA-Z0-9]*\n([\s\S]*?)\n```$"
     match = re.match(pattern, content.strip())
-    match_res=match.group(1).strip() if match else content.strip()
+    match_res = match.group(1).strip() if match else content.strip()
     return re.sub(r"<think>.*?</think>", "", match_res, flags=re.DOTALL).strip()
 
 
-
 def extract_json(text):
     """
     Extracts JSON content from a string, removing enclosing triple backticks and optional 'json' tag if present.
@@ -158,51 +206,15 @@ def process_telemetry_filters(filters):
 
 def sanitize_relationship_for_cypher(relationship) -> str:
     """Sanitize relationship text for Cypher queries by replacing problematic characters."""
-    char_map = {
-        "...": "_ellipsis_",
-        "…": "_ellipsis_",
-        "。": "_period_",
-        "，": "_comma_",
-        "；": "_semicolon_",
-        "：": "_colon_",
-        "！": "_exclamation_",
-        "？": "_question_",
-        "（": "_lparen_",
-        "）": "_rparen_",
-        "【": "_lbracket_",
-        "】": "_rbracket_",
-        "《": "_langle_",
-        "》": "_rangle_",
-        "'": "_apostrophe_",
-        '"': "_quote_",
-        "\\": "_backslash_",
-        "/": "_slash_",
-        "|": "_pipe_",
-        "&": "_ampersand_",
-        "=": "_equals_",
-        "+": "_plus_",
-        "*": "_asterisk_",
-        "^": "_caret_",
-        "%": "_percent_",
-        "$": "_dollar_",
-        "#": "_hash_",
-        "@": "_at_",
-        "!": "_bang_",
-        "?": "_question_",
-        "(": "_lparen_",
-        ")": "_rparen_",
-        "[": "_lbracket_",
-        "]": "_rbracket_",
-        "{": "_lbrace_",
-        "}": "_rbrace_",
-        "<": "_langle_",
-        ">": "_rangle_",
-    }
 
     # Apply replacements and clean up
     sanitized = relationship
-    for old, new in char_map.items():
-        sanitized = sanitized.replace(old, new)
 
-    return re.sub(r"_+", "_", sanitized).strip("_")
+    # First handle all multi-character replacements
+    for old in _multi_keys:
+        sanitized = sanitized.replace(old, _char_map[old])
+
+    # Next, handle all single-character replacements in one pass
+    sanitized = sanitized.translate(_translation_table)
 
+    return _re_sub_underscores.sub("_", sanitized).strip("_")