QML Timer with Animation still running too fast on Windows

import QtQuick 2.3
import QtQuick.Window 2.0

Window {

    Timer {
        property var lastTime
        interval: 1000
        running: true
        repeat: true
        onTriggered: {
            if (lastTime) {
                console.log(Date.now() - lastTime);
            }
            lastTime = Date.now();
        }
    }

    property int a
    SequentialAnimation on a {
        loops: Animation.Infinite
        NumberAnimation { from: 0; to: 1; duration: 1000 }
    }
}

qml: 929
qml: 960
qml: 944
qml: 944
qml: 943