drop onGameTick20 - it has some savings on cpu, but racers demand millisecond precision not 20 millisecond, apparently
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<class>MainWindow</class>
<widget class="QMainWindow" name="MainWindow">
<property name="geometry">
<rect>
<x>0</x>
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<height>400</height>
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<property name="windowTitle">
<string>MainWindow</string>
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<widget class="QWidget" name="centralWidget">
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<widget class="QPlainTextEdit" name="plainTextEdit"/>
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<widget class="QPushButton" name="pbUndo">
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<item>
<widget class="QPushButton" name="pbSave">
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<item>
<widget class="QPushButton" name="pbLoad">
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<item>
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<property name="buttonSymbols">
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<header>drawmapwidget.h</header>
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