QGraphics scene use lagre memory count

[Lokis]

Good day. It was necessary for me write application which draw graph. For base code I used examles 40000 chips. Nodes and eges work correctly, but I have large problem. In some cases qt begin use lagre amount memory (gigabates). But it is not memory leak. I think that at use memory for intersection. So if reimplement function "shape" in class lines - qt don't demant memory. But in this case drawing will be wrong. How I can solve this problem with memory (if it is possible)?

Here is function where I create graph. It is im file GraphWidget.cpp

void GraphWidget::DoTestGraph()
{
    QSharedPointer<GraphStruct> testGraph;
    testGraph = QSharedPointer<GraphStruct>(new GraphStruct);
    for (size_t ind = 0; ind < 100; ++ind)  // Create nodes (Horizontal node count)
    {
        for (size_t jnd = 0; jnd < 100; ++jnd) // Vertical node count
        {    
            GraphStruct::GraphVertex testvertex(QPoint(50*ind, 50*jnd), "node", "node_descr");
            testGraph->vertexList.push_back(testvertex);
        }
    }
    for (size_t ind = 0; ind < testGraph->vertexList.size() - 3; ++ind) // Create edges (links)
    {
        GraphStruct::GraphEdge testedge("link", "link_desc", 0/*to node*/, ind + 1/*from node*/); // Do all links to one node
        testGraph->edgeList.push_back(testedge);
    }
    graphView->CreateGraph(testGraph);
}

void GraphWidget::DoTestGraph()
{
    QSharedPointer<GraphStruct> testGraph;
    testGraph = QSharedPointer<GraphStruct>(new GraphStruct);
    for (size_t ind = 0; ind < 100; ++ind)  // Create nodes (Horizontal node count)
    {
        for (size_t jnd = 0; jnd < 100; ++jnd) // Vertical node count
        {    
            GraphStruct::GraphVertex testvertex(QPoint(50*ind, 50*jnd), "node", "node_descr");
            testGraph->vertexList.push_back(testvertex);
        }
    }
    for (size_t ind = 0; ind < testGraph->vertexList.size() - 3; ++ind) // Create edges (links)
    {
        GraphStruct::GraphEdge testedge("link", "link_desc", 0/*to node*/, ind + 1/*from node*/); // Do all links to one node
        testGraph->edgeList.push_back(testedge);
    }
    graphView->CreateGraph(testGraph);
}

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At this place begin large memory allocation

#include "..\..\QueryClient\NewGUI\QT_graph\GraphWidget.h"
#include <QtWidgets/QApplication>
 
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
 
    ST::User::GraphWidget gw;
    gw.show();
 
    return a.exec(); // At this place begin large memory allocation
}

#include "..\..\QueryClient\NewGUI\QT_graph\GraphWidget.h"
#include <QtWidgets/QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    ST::User::GraphWidget gw;
    gw.show();

    return a.exec(); // At this place begin large memory allocation
}

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I attach files which necessary to compile project. If necessary change pos nodes or links when graph creates, so change function DoTestGraph