diff --git a/codeflash/languages/java/remove_asserts.py b/codeflash/languages/java/remove_asserts.py
index 3289a9568..34908d89d 100644
--- a/codeflash/languages/java/remove_asserts.py
+++ b/codeflash/languages/java/remove_asserts.py
@@ -213,6 +213,9 @@ def __init__(
         self._CHAR_LITERAL_RE = re.compile(r"^'.'$|^'\\.'$")
         self._cast_re = re.compile(r"^\((\w+)\)")
 
+        # Cache for inferred types to avoid repeated expensive inference work
+        self._type_infer_cache: dict[tuple[str, str], str] = {}
+
     def transform(self, source: str) -> str:
         """Remove assertions from source code, preserving target function calls.
 
@@ -928,7 +931,13 @@ def _infer_return_type(self, assertion: AssertionMatch) -> str:
 
         # For assertEquals/assertNotEquals/assertSame, try to infer from the expected literal
         if method in JUNIT5_VALUE_ASSERTIONS:
-            return self._infer_type_from_assertion_args(assertion.original_text, method)
+            key = (assertion.original_text, method)
+            cached = self._type_infer_cache.get(key)
+            if cached is not None:
+                return cached
+            inferred = self._infer_type_from_assertion_args(assertion.original_text, method)
+            self._type_infer_cache[key] = inferred
+            return inferred
 
         # For fluent assertions (assertThat), type inference is harder — keep Object
         return "Object"