diff --git a/core/ssrf.h b/core/ssrf.h
index 7f65f2dc5..20dc569a4 100644
--- a/core/ssrf.h
+++ b/core/ssrf.h
@@ -12,6 +12,21 @@ extern "C" {
 #endif
 
 #ifdef __cplusplus
+
+#ifdef SUBSURFACE_MOBILE
+#ifdef ENABLE_STARTUP_TIMING
+// Declare generic function, will be seen only in CPP code
+// Use void parameters to avoid extra includes
+extern void log_stp(const char *ident, QString *buf);
+
+#define LOG_STP(x) log_stp(x, NULL)
+#define LOG_STP_CLIPBOARD(x) log_stp(NULL, x)
+#else
+#define LOG_STP(x)
+#define LOG_STP_CLIPBOARD(x)
+#endif // ENABLE_STARTUP_TIMING
+#endif // SUBSURFACE_MOBILE
+
 }
 #else
 
diff --git a/mobile-widgets/qmlmanager.cpp b/mobile-widgets/qmlmanager.cpp
index 4a15f26e0..33376656b 100644
--- a/mobile-widgets/qmlmanager.cpp
+++ b/mobile-widgets/qmlmanager.cpp
@@ -32,6 +32,8 @@
 #include "qt-models/tankinfomodel.h"
 #include "core/downloadfromdcthread.h"
 
+#include "core/ssrf.h"
+
 QMLManager *QMLManager::m_instance = NULL;
 
 #define RED_FONT QLatin1Literal("<font color=\"red\">")
@@ -138,6 +140,7 @@ QMLManager::QMLManager() : m_locationServiceEnabled(false),
 	alreadySaving(false),
 	m_device_data(new DCDeviceData(this))
 {
+	LOG_STP("qmlmgr starting");
 	m_instance = this;
 	m_lastDevicePixelRatio = qApp->devicePixelRatio();
 	timer.start();
@@ -164,6 +167,7 @@ QMLManager::QMLManager() : m_locationServiceEnabled(false),
 				+ " at " + QDateTime::currentDateTime().toString());
 	}
 #endif
+	LOG_STP("qmlmgr log started");
 	set_error_cb(&showErrorFromC);
 	appendTextToLog("Starting " + getUserAgent());
 	appendTextToLog(QStringLiteral("built with libdivecomputer v%1").arg(dc_version(NULL)));
@@ -172,11 +176,13 @@ QMLManager::QMLManager() : m_locationServiceEnabled(false),
 	git_libgit2_version(&git_maj, &git_min, &git_rev);
 	appendTextToLog(QStringLiteral("built with libgit2 %1.%2.%3").arg(git_maj).arg(git_min).arg(git_rev));
 	setStartPageText(tr("Starting..."));
+	LOG_STP("qmlmgr start page");
 
 	// ensure that we start the BTDiscovery - this should be triggered by the export of the class
 	// to QML, but that doesn't seem to always work
 	BTDiscovery *btDiscovery = BTDiscovery::instance();
 	m_btEnabled = btDiscovery->btAvailable();
+	LOG_STP("qmlmgr bt available");
 	connect(&btDiscovery->localBtDevice, &QBluetoothLocalDevice::hostModeStateChanged,
 		this, &QMLManager::btHostModeChange);
 	setShowPin(false);
@@ -185,10 +191,13 @@ QMLManager::QMLManager() : m_locationServiceEnabled(false),
 	progress_callback = &progressCallback;
 	connect(locationProvider, SIGNAL(haveSourceChanged()), this, SLOT(hasLocationSourceChanged()));
 	setLocationServiceAvailable(locationProvider->hasLocationsSource());
+	LOG_STP("qmlmgr gps started");
 	set_git_update_cb(&gitProgressCB);
+	LOG_STP("qmlmgr git update");
 
 	// make sure we know if the current cloud repo has been successfully synced
 	syncLoadFromCloud();
+	LOG_STP("qmlmgr sync load cloud");
 }
 
 void QMLManager::applicationStateChanged(Qt::ApplicationState state)
@@ -352,6 +361,7 @@ void QMLManager::copyAppLogToClipboard()
 		QTextStream in(&f);
 		copyString += in.readAll();
 	}
+	LOG_STP_CLIPBOARD(&copyString);
 	copyString += "---------- finish ----------\n";
 
 	// and copy to clipboard
diff --git a/subsurface-mobile-helper.cpp b/subsurface-mobile-helper.cpp
index 38b6be9f4..5fe83acd9 100644
--- a/subsurface-mobile-helper.cpp
+++ b/subsurface-mobile-helper.cpp
@@ -29,6 +29,8 @@
 
 #include "mobile-widgets/qml/kirigami/src/kirigamiplugin.h"
 
+#include "core/ssrf.h"
+
 QObject *qqWindowObject = NULL;
 
 void set_non_bt_addresses() {
@@ -51,6 +53,7 @@ void init_ui()
 
 void run_ui()
 {
+	LOG_STP("run_ui starting");
 	qmlRegisterType<QMLManager>("org.subsurfacedivelog.mobile", 1, 0, "QMLManager");
 	qmlRegisterType<QMLProfile>("org.subsurfacedivelog.mobile", 1, 0, "QMLProfile");
 
@@ -63,6 +66,7 @@ void run_ui()
 	qmlRegisterType<MapLocation>("org.subsurfacedivelog.mobile", 1, 0, "MapLocation");
 
 	QQmlApplicationEngine engine;
+	LOG_STP("run_ui qml engine started");
 	KirigamiPlugin::getInstance().registerTypes();
 #if defined(__APPLE__) && !defined(Q_OS_IOS)
 	// when running the QML UI on a Mac the deployment of the QML Components seems
@@ -79,11 +83,13 @@ void run_ui()
 #endif
 	engine.addImportPath("qrc://imports");
 	DiveListModel diveListModel;
+	LOG_STP("run_ui diveListModel started");
 	DiveListSortModel *sortModel = new DiveListSortModel(0);
 	sortModel->setSourceModel(&diveListModel);
 	sortModel->setDynamicSortFilter(true);
 	sortModel->setSortRole(DiveListModel::DiveDateRole);
 	sortModel->sort(0, Qt::DescendingOrder);
+	LOG_STP("run_ui diveListModel sorted");
 	GpsListModel gpsListModel;
 	QSortFilterProxyModel *gpsSortModel = new QSortFilterProxyModel(0);
 	gpsSortModel->setSourceModel(&gpsListModel);
@@ -95,11 +101,13 @@ void run_ui()
 	ctxt->setContextProperty("gpsModel", gpsSortModel);
 	ctxt->setContextProperty("vendorList", vendorList);
 	set_non_bt_addresses();
+	LOG_STP("run_ui set_non_bt_adresses");
 
 	ctxt->setContextProperty("connectionListModel", &connectionListModel);
 	ctxt->setContextProperty("logModel", MessageHandlerModel::self());
 
 	engine.load(QUrl(QStringLiteral("qrc:///qml/main.qml")));
+	LOG_STP("run_ui qml loaded");
 	qqWindowObject = engine.rootObjects().value(0);
 	if (!qqWindowObject) {
 		fprintf(stderr, "can't create window object\n");
@@ -112,8 +120,10 @@ void run_ui()
 	QScreen *screen = qml_window->screen();
 	QObject::connect(qml_window, &QQuickWindow::screenChanged, QMLManager::instance(), &QMLManager::screenChanged);
 	QMLManager *manager = QMLManager::instance();
+	LOG_STP("run_ui qmlmanager instance started");
 	// now that the log file is initialized...
 	show_computer_list();
+	LOG_STP("run_ui show_computer_list");
 
 	manager->setDevicePixelRatio(qml_window->devicePixelRatio(), qml_window->screen());
 	manager->dlSortModel = sortModel;
@@ -124,6 +134,7 @@ void run_ui()
 	qml_window->setWidth(800);
 #endif
 	qml_window->show();
+	LOG_STP("run_ui running exec");
 	qApp->exec();
 }
 
diff --git a/subsurface-mobile-main.cpp b/subsurface-mobile-main.cpp
index 878dc59ea..131e1d493 100644
--- a/subsurface-mobile-main.cpp
+++ b/subsurface-mobile-main.cpp
@@ -19,14 +19,50 @@
 #include <QLocale>
 #include <git2.h>
 
+// Implementation of STP logging
+#include "core/ssrf.h"
+#ifdef ENABLE_STARTUP_TIMING
+#include <QElapsedTimer>
+#include <QMutex>
+#include <QMutexLocker>
+void log_stp(const char *ident, QString *buf)
+{
+	static bool firstCall = true;
+	static QElapsedTimer stpDuration;
+	static QString stpText;
+	static QMutex logMutex;
+
+	QMutexLocker l(&logMutex);
+
+	if (firstCall) {
+		firstCall = false;
+		stpDuration.start();
+	}
+	if (ident)
+		stpText += QString("STP ") \
+					.append(QString::number(stpDuration.elapsed())) \
+					.append(" ms, ") \
+					.append(ident) \
+					.append("\n");
+	if (buf) {
+		*buf += "---------- startup timer ----------\n";
+		*buf += stpText;
+	}
+}
+#endif // ENABLE_STARTUP_TIMING
+
+
 int main(int argc, char **argv)
 {
+	LOG_STP("main starting");
+
 	int i;
 	QGuiApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
 	QLoggingCategory::setFilterRules(QStringLiteral("qt.bluetooth* = true"));
 
 	// Start application
 	new QApplication(argc, argv);
+	LOG_STP("main Qt started");
 
 	// and get comand line arguments
 	QStringList arguments = QCoreApplication::arguments();
@@ -41,6 +77,7 @@ int main(int argc, char **argv)
 		}
 	}
 	git_libgit2_init();
+	LOG_STP("main git loaded");
 	setup_system_prefs();
 	if (QLocale().measurementSystem() == QLocale::MetricSystem)
 		default_prefs.units = SI_units;
@@ -51,8 +88,11 @@ int main(int argc, char **argv)
 	fill_computer_list();
 
 	parse_xml_init();
+	LOG_STP("main xml parsed");
 	taglist_init_global();
+	LOG_STP("main taglist done");
 	init_ui();
+	LOG_STP("main init_ui done");
 	if (prefs.default_file_behavior == LOCAL_DEFAULT_FILE)
 		set_filename(prefs.default_filename);
 	else
@@ -66,6 +106,7 @@ int main(int argc, char **argv)
 
 	init_proxy();
 
+	LOG_STP("main call run_ui (continue in qmlmanager)");
 	if (!quit)
 		run_ui();
 	exit_ui();