I fixed the slow issue, but theres a new problem.
My custom model has a reimplemented setData() :
Qt Code: 
  1. bool RomList::setData(const QModelIndex &index, const QVariant &value, int role) {
  2.   if(index.isValid() && role == Qt::DisplayRole  ) {
  3.       if(index.column() == 4) {
  4.           int row = index.row();
  5.           QStringList tmp = ROMs.at(row).split(";");
  6.           tmp.replace(4, QString::number(value.toInt()));
  7.           ROMs.replace(row, tmp.join(";"));
  8.           emit dataChanged(index, index);
  9.           return true;
  10.         } else {
  11.     return false;
  12.         }
  13.     }
  14.   return false;
  15. }
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All the table data loads from ROMs QstringList, so if i change some cell of column 4, it will be updated, but only works with some cells, some works, some doesn't work, its trange.

Here is the data change:
Qt Code: 
  1. void RetroGC::incPlayed(QString stipo, QString sid, int num, int row) {
  2.   QSettings romList(QString("Data/ROMLists/%1/%2.rgl").arg(stipo).arg(sid), QSettings::IniFormat);
  3.   QStringList tmp = romList.value(QString("ROMS/%1").arg(num)).toString().split(";");
  4.  
  5.   qint32 xt = gameList->index(row, 4).data(Qt::DisplayRole).toInt();
  6.   xt++;
  7.   tmp.replace(4, QString::number(xt));
  8.   romList.setValue(QString("ROMS/%1").arg(num), tmp.join(";"));
  9.   gameList->setData(  gameList->index(row, 4), xt, Qt::DisplayRole );
  10. }
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i've been 2 hours stucked and investigating, but i can't find where is the problem.