diff --git a/src/python/jw/pkg/cmds/projects/CmdBuild.py b/src/python/jw/pkg/cmds/projects/CmdBuild.py
index ee5c93f7..1055cc56 100644
--- a/src/python/jw/pkg/cmds/projects/CmdBuild.py
+++ b/src/python/jw/pkg/cmds/projects/CmdBuild.py
@@ -2,6 +2,7 @@
 
 import os, re, sys, subprocess, datetime, time
 from argparse import Namespace, ArgumentParser
+from functools import lru_cache
 
 from ...lib.log import *
 from ..Cmd import Cmd
@@ -25,6 +26,7 @@ class CmdBuild(Cmd): # export
 
     def _run(self, args: Namespace) -> None:
 
+        @lru_cache(maxsize=None)
         def read_deps(cur, prereq_type):
             # dep cache doesn't make a difference at all
             if prereq_type in dep_cache:
@@ -42,9 +44,6 @@ class CmdBuild(Cmd): # export
             dep_cache[prereq_type][cur] = ret
             return ret
 
-        def read_deps_cached(cur, prereq_type):
-            return self.app.res_cache.run(read_deps, [ cur, prereq_type ])
-
         def add_dep_tree(cur, prereq_types, tree, all_deps):
             log(DEBUG, "adding prerequisites " + ' '.join(prereq_types) + " of module " + cur)
             if cur in all_deps:
@@ -54,7 +53,7 @@ class CmdBuild(Cmd): # export
             all_deps.add(cur)
             for t in prereq_types:
                 log(DEBUG, "checking prereqisites of type " + t)
-                deps.update(read_deps_cached(cur, t))
+                deps.update(read_deps(cur, t))
             for d in deps:
                 add_dep_tree(d, prereq_types, tree, all_deps)
             tree[cur] = deps