Ускорить запуск pyqt программки через multiprocessing

#!/usr/bin/python3
# -*- coding: utf-8 -*-

import sys
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
from multiprocessing import Process, Pool


class Test(QWidget):
    def __init__(self):
        super().__init__()
        self.layout = QVBoxLayout()
        self.setLayout(self.layout)

        self.label = QLabel()
        self.layout.addWidget(self.label)

        self.pixmap = QPixmap()


def set_pixmap(classname=None):
    classname.pixmap.load('test.jpg')
    classname.label.setPixmap(classname.pixmap)

if __name__ == '__main__':
    app = QApplication(sys.argv)
    test = Test()
    test.show()

    proc = Process(target=set_pixmap, kwargs={'classname': test})
    proc.start()
    proc.join()

    # pool = Pool()
    # pool.map(set_pixmap, (test,))
    # pool.close()
    # pool.join()

    sys.exit(app.exec_())

Process ForkPoolWorker-1:
Traceback (most recent call last):
  File "/usr/lib/python3.5/multiprocessing/process.py", line 254, in _bootstrap
    self.run()
  File "/usr/lib/python3.5/multiprocessing/process.py", line 93, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/lib/python3.5/multiprocessing/pool.py", line 108, in worker
    task = get()
  File "/usr/lib/python3.5/multiprocessing/queues.py", line 345, in get
    return ForkingPickler.loads(res)
RuntimeError: super-class __init__() of type Test was never called