Merge pull request #41077 from Calinou/doc-find-node-find-parent

Mention performance caveats about `find_node()` and `find_parent()`

doc/classes/Node.xml

@@ -194,6 +194,7 @@
 				Finds a descendant of this node whose name matches [code]mask[/code] as in [method String.match] (i.e. case-sensitive, but [code]"*"[/code] matches zero or more characters and [code]"?"[/code] matches any single character except [code]"."[/code]).
 				[b]Note:[/b] It does not match against the full path, just against individual node names.
 				If [code]owned[/code] is [code]true[/code], this method only finds nodes whose owner is this node. This is especially important for scenes instantiated through a script, because those scenes don't have an owner.
+				[b]Note:[/b] As this method walks through all the descendants of the node, it is the slowest way to get a reference to another node. Whenever possible, consider using [method get_node] instead. To avoid using [method find_node] too often, consider caching the node reference into a variable.
 			</description>
 		</method>
 		<method name="find_parent" qualifiers="const">
@@ -204,6 +205,7 @@
 			<description>
 				Finds the first parent of the current node whose name matches [code]mask[/code] as in [method String.match] (i.e. case-sensitive, but [code]"*"[/code] matches zero or more characters and [code]"?"[/code] matches any single character except [code]"."[/code]).
 				[b]Note:[/b] It does not match against the full path, just against individual node names.
+				[b]Note:[/b] As this method walks upwards in the scene tree, it can be slow in large, deeply nested scene trees. Whenever possible, consider using [method get_node] instead. To avoid using [method find_parent] too often, consider caching the node reference into a variable.
 			</description>
 		</method>
 		<method name="get_child" qualifiers="const">