diff --git a/db/ConfigBuilder.cpp b/db/ConfigBuilder.cpp
index 5ea8ad5..62f0855 100644
--- a/db/ConfigBuilder.cpp
+++ b/db/ConfigBuilder.cpp
@@ -15,8 +15,8 @@ namespace NekoRay {
 
     QStringList getAutoBypassExternalProcessPaths(const QSharedPointer<BuildConfigResult> &result) {
         QStringList paths;
-        for (const auto &ext: result->exts) {
-            auto path = ext.first.program;
+        for (const auto &extR: result->extRs) {
+            auto path = extR->program;
             if (path.trimmed().isEmpty()) continue;
             paths << path.replace("\\", "/");
         }
@@ -553,7 +553,7 @@ namespace NekoRay {
             auto stream = GetStreamSettings(ent->bean.data());
 
             if (thisExternalStat > 0) {
-                const auto extR = ent->bean->BuildExternal(ext_mapping_port, ext_socks_port, thisExternalStat);
+                auto extR = ent->bean->BuildExternal(ext_mapping_port, ext_socks_port, thisExternalStat);
                 if (extR.program.isEmpty()) {
                     status->result->error = QObject::tr("Core not found: %1").arg(ent->bean->DisplayType());
                     return {};
@@ -562,6 +562,8 @@ namespace NekoRay {
                     status->result->error = extR.error;
                     return {};
                 }
+                extR.tag = ent->bean->DisplayType();
+                status->result->extRs.emplace_back(std::make_shared<fmt::ExternalBuildResult>(extR));
 
                 // SOCKS OUTBOUND
                 if (IS_NEKO_BOX) {
@@ -579,14 +581,6 @@ namespace NekoRay {
                     settings["servers"] = servers;
                     outbound["settings"] = settings;
                 }
-
-                // EXTERNAL PROCESS
-                QSharedPointer<sys::ExternalProcess> extC(new sys::ExternalProcess());
-                extC->tag = ent->bean->DisplayType();
-                extC->program = extR.program;
-                extC->arguments = extR.arguments;
-                extC->env = extR.env;
-                status->result->exts.emplace_back(extR, extC);
             } else {
                 const auto coreR = IS_NEKO_BOX ? ent->bean->BuildCoreObjSingBox() : ent->bean->BuildCoreObjV2Ray();
                 if (coreR.outbound.isEmpty()) {
diff --git a/db/ConfigBuilder.hpp b/db/ConfigBuilder.hpp
index 1fa35dc..ed411b8 100644
--- a/db/ConfigBuilder.hpp
+++ b/db/ConfigBuilder.hpp
@@ -13,7 +13,7 @@ namespace NekoRay {
         QSharedPointer<traffic::TrafficData> outboundStat;         // main
         QStringList ignoreConnTag;
 
-        std::list<std::pair<fmt::ExternalBuildResult, QSharedPointer<sys::ExternalProcess>>> exts; // extR to extC
+        std::list<std::shared_ptr<NekoRay::fmt::ExternalBuildResult>> extRs;
     };
 
     class BuildConfigStatus {
diff --git a/fmt/AbstractBean.hpp b/fmt/AbstractBean.hpp
index 88aec9b..db6784b 100644
--- a/fmt/AbstractBean.hpp
+++ b/fmt/AbstractBean.hpp
@@ -17,6 +17,9 @@ namespace NekoRay::fmt {
         QString program;
         QStringList env;
         QStringList arguments;
+        //
+        QString tag;
+        //
         QString error;
         QString config_export;
     };
diff --git a/main/NekoRay_Utils.cpp b/main/NekoRay_Utils.cpp
index cac07bc..b8d2ab8 100644
--- a/main/NekoRay_Utils.cpp
+++ b/main/NekoRay_Utils.cpp
@@ -210,7 +210,12 @@ int MessageBoxInfo(const QString &title, const QString &text) {
 void runOnUiThread(const std::function<void()> &callback, QObject *parent) {
     // any thread
     auto *timer = new QTimer();
-    timer->moveToThread(parent == nullptr ? mainwindow->thread() : parent->thread());
+    auto thread = dynamic_cast<QThread *>(parent);
+    if (thread == nullptr) {
+        timer->moveToThread(parent == nullptr ? mainwindow->thread() : parent->thread());
+    } else {
+        timer->moveToThread(thread);
+    }
     timer->setSingleShot(true);
     QObject::connect(timer, &QTimer::timeout, [=]() {
         // main thread
diff --git a/main/NekoRay_Utils.hpp b/main/NekoRay_Utils.hpp
index 2007b4a..f164ba6 100644
--- a/main/NekoRay_Utils.hpp
+++ b/main/NekoRay_Utils.hpp
@@ -23,6 +23,11 @@ inline std::function<void(QString, QString)> MW_show_log_ext;
 inline std::function<void(QString)> MW_show_log_ext_vt100;
 inline std::function<void(QString, QString)> MW_dialog_message;
 
+// Dispatchers
+
+class QThread;
+inline QThread *DS_cores;
+
 // String
 
 #define FIRST_OR_SECOND(a, b) a.isEmpty() ? b : a
diff --git a/main/main.cpp b/main/main.cpp
index 22c6b52..359704d 100644
--- a/main/main.cpp
+++ b/main/main.cpp
@@ -7,6 +7,7 @@
 #include <QStandardPaths>
 #include <QLocalSocket>
 #include <QLocalServer>
+#include <QThread>
 
 #include "3rdparty/RunGuard.hpp"
 #include "main/NekoRay.hpp"
@@ -121,6 +122,10 @@ int main(int argc, char* argv[]) {
     delete preQApp;
     QApplication a(argc, argv);
 
+    // dispatchers
+    DS_cores = new QThread;
+    DS_cores->start();
+
     // RunGuard
     RunGuard guard("nekoray" + wd.absolutePath());
     quint64 guard_data_in = GetRandomUint64();
diff --git a/sys/ExternalProcess.cpp b/sys/ExternalProcess.cpp
index b19afe7..07f7a38 100644
--- a/sys/ExternalProcess.cpp
+++ b/sys/ExternalProcess.cpp
@@ -4,8 +4,10 @@
 #include <QTimer>
 #include <QDir>
 #include <QApplication>
+#include <QThread>
 
 namespace NekoRay::sys {
+
     ExternalProcess::ExternalProcess() : QProcess() {
         // qDebug() << "[Debug] ExternalProcess()" << this << running_ext;
         this->env = QProcessEnvironment::systemEnvironment().toStringList();
@@ -21,7 +23,9 @@ namespace NekoRay::sys {
 
         if (managed) {
             connect(this, &QProcess::readyReadStandardOutput, this, [&]() {
-                MW_show_log_ext_vt100(readAllStandardOutput().trimmed());
+                auto log = readAllStandardOutput();
+                if (logCounter.fetchAndAddRelaxed(log.count("\n")) > NekoRay::dataStore->max_log_line) return;
+                MW_show_log_ext_vt100(log);
             });
             connect(this, &QProcess::readyReadStandardError, this, [&]() {
                 MW_show_log_ext_vt100(readAllStandardError().trimmed());
@@ -36,7 +40,7 @@ namespace NekoRay::sys {
             connect(this, &QProcess::stateChanged, this, [&](QProcess::ProcessState state) {
                 if (state == QProcess::NotRunning) {
                     if (killed) { // 用户命令退出
-                        MW_show_log_ext(tag, "Stopped");
+                        MW_show_log_ext(tag, "External core stopped");
                     } else if (!crashed) { // 异常退出
                         crashed = true;
                         MW_show_log_ext(tag, "[Error] Program exited accidentally: " + errorString());
@@ -45,7 +49,7 @@ namespace NekoRay::sys {
                     }
                 }
             });
-            MW_show_log_ext(tag, "[Starting] " + env.join(" ") + " " + program + " " + arguments.join(" "));
+            MW_show_log_ext(tag, "External core starting: " + env.join(" ") + " " + program + " " + arguments.join(" "));
         }
 
         QProcess::setEnvironment(env);
@@ -76,7 +80,9 @@ namespace NekoRay::sys {
         ExternalProcess::arguments = args;
 
         connect(this, &QProcess::readyReadStandardOutput, this, [&]() {
-            MW_show_log(readAllStandardOutput().trimmed());
+            auto log = readAllStandardOutput();
+            if (logCounter.fetchAndAddRelaxed(log.count("\n")) > NekoRay::dataStore->max_log_line) return;
+            MW_show_log(log);
         });
         connect(this, &QProcess::readyReadStandardError, this, [&]() {
             auto log = readAllStandardError().trimmed();
diff --git a/sys/ExternalProcess.hpp b/sys/ExternalProcess.hpp
index 90c701f..225709b 100644
--- a/sys/ExternalProcess.hpp
+++ b/sys/ExternalProcess.hpp
@@ -40,5 +40,7 @@ namespace NekoRay::sys {
     };
 
     // 手动管理
-    inline QList<QSharedPointer<ExternalProcess>> running_ext;
+    inline std::list<QSharedPointer<ExternalProcess>> running_ext;
+
+    inline QAtomicInt logCounter;
 } // namespace NekoRay::sys
diff --git a/ui/edit/edit_custom.cpp b/ui/edit/edit_custom.cpp
index 10de99b..46f0830 100644
--- a/ui/edit/edit_custom.cpp
+++ b/ui/edit/edit_custom.cpp
@@ -115,15 +115,14 @@ void EditCustom::onStart(QSharedPointer<NekoRay::ProxyEntity> _ent) {
             MessageBoxInfo(software_name, result->error);
             return;
         }
-        for (const auto &ext: result->exts) {
-            auto extR = ext.first;
-            auto command = QStringList{extR.program};
-            command += extR.arguments;
+        for (const auto &extR: result->extRs) {
+            auto command = QStringList{extR->program};
+            command += extR->arguments;
             auto btn = QMessageBox::information(this, tr("Preview config"),
-                                                QString("Command: %1\n\n%2").arg(QStringList2Command(command), extR.config_export),
+                                                QString("Command: %1\n\n%2").arg(QStringList2Command(command), extR->config_export),
                                                 "OK", "Copy", "", 0, 0);
             if (btn == 1) {
-                QApplication::clipboard()->setText(extR.config_export);
+                QApplication::clipboard()->setText(extR->config_export);
             }
         }
     });
diff --git a/ui/mainwindow.cpp b/ui/mainwindow.cpp
index dc9ba9e..63fdad8 100644
--- a/ui/mainwindow.cpp
+++ b/ui/mainwindow.cpp
@@ -47,7 +47,6 @@
 #include <QElapsedTimer>
 
 QElapsedTimer coreRestartTimer;
-// QAtomicInt logCounter;
 
 void UI_InitMainWindow() {
     mainwindow = new MainWindow;
@@ -150,11 +149,6 @@ MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWi
     MW_show_log_ext_vt100 = [=](const QString &log) {
         runOnUiThread([=] { show_log_impl(cleanVT100String(log)); });
     };
-    //
-    // auto logCounterTimer = new QTimer(this);
-    // connect(logCounterTimer, &QTimer::timeout, this, [&] { logCounter.fetchAndStoreRelaxed(0); });
-    // logCounterTimer->setInterval(1000);
-    // logCounterTimer->start();
 
     // table UI
     ui->proxyListTable->callback_save_order = [=] {
@@ -416,10 +410,13 @@ MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWi
     if (NekoRay::dataStore->flag_debug) args.push_back("-debug");
 
     // Start core
-    core_process = new NekoRay::sys::CoreProcess(core_path, args);
-    core_process->Start();
-
-    setup_grpc();
+    runOnUiThread(
+        [=] {
+            core_process = new NekoRay::sys::CoreProcess(core_path, args);
+            core_process->Start();
+            setup_grpc();
+        },
+        DS_cores);
 
     // Start last
     if (NekoRay::dataStore->remember_enable) {
@@ -436,6 +433,14 @@ MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWi
 
     connect(qApp, &QGuiApplication::commitDataRequest, this, &MainWindow::on_commitDataRequest);
 
+    auto t = new QTimer;
+    connect(t, &QTimer::timeout, this, [=]() { refresh_status(); });
+    t->start(2000);
+
+    t = new QTimer;
+    connect(t, &QTimer::timeout, this, [&] { NekoRay::sys::logCounter.fetchAndStoreRelaxed(0); });
+    t->start(1000);
+
     if (!NekoRay::dataStore->flag_tray) show();
 }
 
@@ -1497,7 +1502,6 @@ void MainWindow::show_log_impl(const QString &log) {
         if (showThisLine) newLines << line;
     }
     if (newLines.isEmpty()) return;
-    // if (logCounter.fetchAndAddRelaxed(newLines.count()) > NekoRay::dataStore->max_log_line) return;
 
     FastAppendTextDocument(newLines.join("\n"), qvLogDocument);
     // qvLogDocument->setPlainText(qvLogDocument->toPlainText() + log);
diff --git a/ui/mainwindow.h b/ui/mainwindow.h
index d98d1ae..9849561 100644
--- a/ui/mainwindow.h
+++ b/ui/mainwindow.h
@@ -185,7 +185,7 @@ private:
 
     // grpc and ...
 
-    void setup_grpc();
+    static void setup_grpc();
 
     void speedtest_current_group(int mode);
 
diff --git a/ui/mainwindow_grpc.cpp b/ui/mainwindow_grpc.cpp
index 1c3f3e1..928c045 100644
--- a/ui/mainwindow_grpc.cpp
+++ b/ui/mainwindow_grpc.cpp
@@ -14,6 +14,26 @@
 #include <QDesktopServices>
 #include <QMessageBox>
 
+// ext core
+
+std::list<QSharedPointer<NekoRay::sys::ExternalProcess>> CreateExtCFromExtR(const std::list<std::shared_ptr<NekoRay::fmt::ExternalBuildResult>> &extRs, bool start) {
+    // plz run and start in same thread
+    std::list<QSharedPointer<NekoRay::sys::ExternalProcess>> l;
+    for (const auto &extR: extRs) {
+        QSharedPointer<NekoRay::sys::ExternalProcess> extC(new NekoRay::sys::ExternalProcess());
+        extC->tag = extR->tag;
+        extC->program = extR->program;
+        extC->arguments = extR->arguments;
+        extC->env = extR->env;
+        l.emplace_back(extC);
+        //
+        if (start) extC->Start();
+    }
+    return l;
+}
+
+// grpc
+
 #ifndef NKR_NO_GRPC
 using namespace NekoRay::rpc;
 #endif
@@ -89,16 +109,13 @@ void MainWindow::speedtest_current_group(int mode) {
                     req.set_url(NekoRay::dataStore->test_url.toStdString());
 
                     //
-                    std::list<std::pair<NekoRay::fmt::ExternalBuildResult, QSharedPointer<NekoRay::sys::ExternalProcess>>> exts;
+                    std::list<QSharedPointer<NekoRay::sys::ExternalProcess>> extCs;
 
                     if (mode == libcore::TestMode::UrlTest || mode == libcore::FullTest) {
                         auto c = NekoRay::BuildConfig(profile, true, false);
                         // TODO refactor external test
-                        if (!c->exts.empty()) {
-                            exts = c->exts;
-                            for (const auto &ext: exts) {
-                                ext.second->Start();
-                            }
+                        if (!c->extRs.empty()) {
+                            extCs = CreateExtCFromExtR(c->extRs, true);
                             QThread::msleep(500);
                         }
                         //
@@ -117,8 +134,8 @@ void MainWindow::speedtest_current_group(int mode) {
 
                     bool rpcOK;
                     auto result = defaultClient->Test(&rpcOK, req);
-                    for (const auto &ext: exts) {
-                        ext.second->Kill();
+                    for (const auto &extC: extCs) {
+                        extC->Kill();
                     }
                     if (!rpcOK) return;
 
@@ -178,16 +195,6 @@ void MainWindow::speedtest_current() {
             } else if (latency > 0) {
                 ui->label_running->setText(tr("Test Result") + ": " + QString("%1 ms").arg(latency));
             }
-            //
-            auto t = new QTimer(this);
-            connect(t, &QTimer::timeout, this, [=] {
-                last_test_time = QTime();
-                refresh_status();
-                t->deleteLater();
-            });
-            t->setInterval(1000);
-            t->setSingleShot(true);
-            t->start();
         });
     });
 #endif
@@ -245,10 +252,12 @@ void MainWindow::neko_start(int _id) {
         NekoRay::traffic::trafficLooper->loop_enabled = true;
 #endif
 
-        for (const auto &ext: result->exts) {
-            NekoRay::sys::running_ext.push_back(ext.second);
-            ext.second->Start();
-        }
+        runOnUiThread(
+            [=] {
+                auto extCs = CreateExtCFromExtR(result->extRs, true);
+                NekoRay::sys::running_ext.splice(NekoRay::sys::running_ext.end(), extCs);
+            },
+            DS_cores);
 
         NekoRay::dataStore->UpdateStartedId(ent->id);
         running = ent;
@@ -301,10 +310,15 @@ void MainWindow::neko_stop(bool crash, bool sem) {
     }
 
     auto neko_stop_stage2 = [=] {
-        while (!NekoRay::sys::running_ext.isEmpty()) {
-            auto extC = NekoRay::sys::running_ext.takeFirst();
-            extC->Kill();
-        }
+        runOnUiThread(
+            [=] {
+                while (!NekoRay::sys::running_ext.empty()) {
+                    auto extC = NekoRay::sys::running_ext.front();
+                    extC->Kill();
+                    NekoRay::sys::running_ext.pop_front();
+                }
+            },
+            DS_cores);
 
 #ifndef NKR_NO_GRPC
         NekoRay::traffic::trafficLooper->loop_enabled = false;