diff --git a/CHANGELOG.md b/CHANGELOG.md
index 80a91db..e51e053 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -24,6 +24,7 @@
 - Remember tree position in menus
 - Show hidden server count after filtering
 - Atomic map filters per server context
+- Use concurrency when checking stale mods (performance uplift)
 
 ## Changed
 - Reduce padding on keys button
diff --git a/dzgui/api/mods.py b/dzgui/api/mods.py
index 81ce751..9010079 100644
--- a/dzgui/api/mods.py
+++ b/dzgui/api/mods.py
@@ -3,6 +3,8 @@ import hashlib
 import logging
 import shlex
 
+from concurrent.futures import wait
+from concurrent.futures import ThreadPoolExecutor
 from dataclasses import dataclass
 from pathlib import Path
 
@@ -145,26 +147,30 @@ def remove_stale_signatures(config: Path, versions: Path) -> None:
         for line in lines:
             f.write(line)
 
-
 def find_stale_mods(config: Path) -> list[int]:
+    def push_record(rec: str) -> list:
+        add = rec.split(":")
+        ip = add[0]
+        qport = add[2]
+        return get_rules(ip, qport)
+
     steam = lookup(config, Preferences.DEFAULT)
     steam_path = Path(steam)
 
-    # TODO: use concurrency
     local = get_local_mod_ids(steam_path)
-    servers = lookup(config, Preferences.IP_LIST)
+    records = lookup(config, Preferences.IP_LIST)
 
-    all_mods = []
-    for server in servers:
-        split = server.split(":")
-        ip = split[0]
-        qport = split[2]
+    remote_mods = []
 
-        mods = get_rules(ip, qport)
-        all_mods += mods
+    with ThreadPoolExecutor() as executor:
+        futures = [
+            executor.submit(push_record, record)
+            for record in records
+        ]
+        wait(futures)
+        for future in futures:
+            res = future.result()
+            remote_mods += res
 
-    stale = []
-    for mod in local:
-        if mod not in all_mods:
-            stale.append(mod)
+    stale = [mod for mod in local if mod not in remote_mods]
     return stale
diff --git a/dzgui/controllers/mc.py b/dzgui/controllers/mc.py
index 2ea5621..510ccba 100644
--- a/dzgui/controllers/mc.py
+++ b/dzgui/controllers/mc.py
@@ -596,6 +596,7 @@ class Controller(GObject.GObject):
             it = mod.iter
             path = model.get_path(it)
             # TODO: consider storing in ListStore as int
+            # TODO: clone existing model and set outside of thread
             if int(mod[2]) in stale:
                 model[path][4] = HEX_RED
 
@@ -731,7 +732,7 @@ class Controller(GObject.GObject):
         func = self.get_callback()
         self.mediator.window.set_sensitive(True)
         # TODO: spawn error dialog if API crawl failed
-        # most likely going to drop this
+        # most likely going to drop callback method
         if func is not None:
             args = self.get_callback_args()
             GLib.idle_add(func, *args)
diff --git a/dzgui/data/CHANGELOG.md b/dzgui/data/CHANGELOG.md
index 80a91db..e51e053 100644
--- a/dzgui/data/CHANGELOG.md
+++ b/dzgui/data/CHANGELOG.md
@@ -24,6 +24,7 @@
 - Remember tree position in menus
 - Show hidden server count after filtering
 - Atomic map filters per server context
+- Use concurrency when checking stale mods (performance uplift)
 
 ## Changed
 - Reduce padding on keys button