@@ -121,6 +121,7 @@ import os

 import sys

 import collections

 import re

+import functools

 import subprocess

 import shutil

 import shlex

@@ -422,6 +423,7 @@ def enum(xml, value):

 ### `supports`

+@functools.cache

 def supports(xml, name, use_aliases=True):

     category, attrib = CATEGORY_ATTRIBS['EXTENSION']

     if xml.xpath(f"{category}[@{attrib}='{name}']"):