diff --git a/package_win.bat b/package_win.bat
index 0fea7bdc..24f8e304 100644
--- a/package_win.bat
+++ b/package_win.bat
@@ -10,8 +10,14 @@ set "out_dir=build\win\package"
 
 set /a MEM_PERCENT=90
 set /a DICT_SIZE_MB=384
-set /a THREAD_COUNT=13
-set "packager=third-party\deps\win\7za-win\7za.exe"
+set "packager=third-party\deps\win\7za\7za.exe"
+
+:: use 70%
+if defined NUMBER_OF_PROCESSORS (
+  set /a THREAD_COUNT=NUMBER_OF_PROCESSORS*70/100
+) else (
+  set /a THREAD_COUNT=2
+)
 
 if not exist "%packager%" (
   1>&2 echo [X] packager app wasn't found