Starting with version 5.10, the use of QSqlRecord runs 300 times slower

#include <QCoreApplication>
#include <QSqlDatabase>
#include <QSqlQuery>
#include <QSqlRecord>
#include <QVariant>
#include <QTime>
#include <QDebug>

int main(int argc, char* argv[])
{
QCoreApplication a(argc, argv);
QSqlDatabase db = QSqlDatabase::addDatabase("QPSQL");
db.setHostName("192.168.1.3");
db.setDatabaseName("ML829MP1");
db.open("postgres", "1");
QSqlQuery q;
q.exec("SELECT * FROM r4035");

QTime time;
time.start();

while (q.next()) {
QSqlRecord r = q.record();
}

qDebug() << "Qt version" << QT_VERSION_STR << ", size:" << q.size() << ", time:" << time.elapsed();
db.close();
return a.exec();
}