diff --git a/jedi/api.py b/jedi/api.py
index 1ed57f6b..98c5f2ec 100644
--- a/jedi/api.py
+++ b/jedi/api.py
@@ -416,49 +416,13 @@ class Script(object):
         return api_classes.CallDef(executable, index, call)
 
     def _func_call_and_param_index(self):
-        def check_user_stmt(user_stmt):
-            if user_stmt is None \
-                        or not isinstance(user_stmt, pr.Statement):
-                return None, 0
-
-            call, index, stop = helpers.search_function_definition(user_stmt, self.pos)
-            return call, index
-
-        def check_cache():
-            """ Do the parsing with a part parser, therefore reduce ressource
-            costs.
-            TODO this is not working with multi-line docstrings, improve.
-            """
-            if self.source_path is None:
-                return None, 0
-
-            try:
-                parser = cache.parser_cache[self.source_path].parser
-            except KeyError:
-                return None, 0
-            part_parser = self._module.get_part_parser()
-            user_stmt = part_parser.user_stmt
-            call, index = check_user_stmt(user_stmt)
-            if call:
-                old_stmt = parser.module.get_statement_for_position(self.pos)
-                if old_stmt is None:
-                    return None, 0
-                old_call, old_index = check_user_stmt(old_stmt)
-                if old_call:
-                    # compare repr because that should definitely be the same.
-                    # Otherwise the whole thing is out of sync.
-                    if repr(old_call) == repr(call):
-                        # return the index of the part_parser
-                        return old_call, index
-            return None, 0
-
         debug.speed('func_call start')
-        call = None
-        index = 0
-        if settings.use_function_definition_cache:
-            call, index = check_cache()
+        call, index = None, 0
         if call is None:
-            call, index = check_user_stmt(self._parser.user_stmt)
+            user_stmt = self._parser.user_stmt
+            if user_stmt is not None and isinstance(user_stmt, pr.Statement):
+                call, index, _ = helpers.search_function_definition(
+                                                        user_stmt, self.pos)
         debug.speed('func_call parsed')
         return call, index
 
diff --git a/jedi/modules.py b/jedi/modules.py
index 398bcf69..37e5bbac 100644
--- a/jedi/modules.py
+++ b/jedi/modules.py
@@ -23,11 +23,9 @@ from ast import literal_eval
 
 from jedi._compatibility import exec_function, unicode
 from jedi import cache
-from jedi import parsing
 from jedi import parsing_representation as pr
 from jedi import fast_parser
 from jedi import debug
-from jedi import settings
 from jedi import common
 
 
@@ -103,7 +101,6 @@ class ModuleWithCursor(Module):
         self._relevant_temp = None
 
         self.source = source
-        self._part_parser = None
 
     @property
     def parser(self):
@@ -251,21 +248,6 @@ class ModuleWithCursor(Module):
         except IndexError:
             raise StopIteration()
 
-    def get_part_parser(self):
-        """ Returns a parser that contains only part of the source code. This
-        exists only because of performance reasons.
-        """
-        if self._part_parser:
-            return self._part_parser
-
-        # TODO check for docstrings
-        length = settings.part_line_length
-        offset = max(self.position[0] - length, 0)
-        s = '\n'.join(self.source.splitlines()[offset:offset + length])
-        self._part_parser = parsing.Parser(s, self.path, self.position,
-                                           offset=(offset, 0))
-        return self._part_parser
-
 
 def get_sys_path():
     def check_virtual_env(sys_path):
diff --git a/jedi/settings.py b/jedi/settings.py
index df48e7ac..e95940fd 100644
--- a/jedi/settings.py
+++ b/jedi/settings.py
@@ -33,7 +33,6 @@ Parser
 ~~~~~~
 
 .. autodata:: fast_parser
-.. autodata:: use_function_definition_cache
 
 
 Dynamic stuff
@@ -149,13 +148,6 @@ something has been changed e.g. to a function. If this happens, only the
 function is being reparsed.
 """
 
-use_function_definition_cache = True
-"""
-Use the cache (full cache) to generate function_definition's. This may fail
-with multiline docstrings (likely) and other complicated changes (unlikely).
-The goal is to move away from it by making the rest faster.
-"""
-
 # ----------------
 # dynamic stuff
 # ----------------