diff --git a/Source/Modules/LMMgr_Core.swift b/Source/Modules/LMMgr_Core.swift
index 0c718501..69a0aee1 100644
--- a/Source/Modules/LMMgr_Core.swift
+++ b/Source/Modules/LMMgr_Core.swift
@@ -60,7 +60,7 @@ public class LMMgr {
   }
 
   public static func loadDataModelsOnAppDelegate() {
-    let globalQueue = DispatchQueue.global(qos: .default)
+    let globalQueue = DispatchQueue(label: "vChewingLM", qos: .unspecified, attributes: .concurrent)
     var showFinishNotification = false
     let group = DispatchGroup()
     group.enter()
@@ -117,7 +117,7 @@ public class LMMgr {
   }
 
   public static func loadDataModel(_ mode: Shared.InputMode) {
-    let globalQueue = DispatchQueue.global(qos: .default)
+    let globalQueue = DispatchQueue(label: "vChewingLM_Lazy", qos: .unspecified, attributes: .concurrent)
     var showFinishNotification = false
     let group = DispatchGroup()
     group.enter()
@@ -326,7 +326,7 @@ public class LMMgr {
   // MARK: UOM
 
   public static func saveUserOverrideModelData() {
-    let globalQueue = DispatchQueue.global(qos: .default)
+    let globalQueue = DispatchQueue(label: "vChewingLM_UOM", qos: .unspecified, attributes: .concurrent)
     let group = DispatchGroup()
     group.enter()
     globalQueue.async {