My model was working wit a QStringList, each QString was a row, Name;Type;Company;etc... then i was using section() to get the data for each row cell. I've replaced the QStringList with QList<QStrngList>, i didn't know that section() were too slow, but with QList<QStringList> and using just MyListQSList.at(index.row()).at( column-nuber ) is very fast, just instantly:

Qt Code: 
  1. QVariant rs_GameModel::data(const QModelIndex &index, int role) const { ////////////////////////////////////////////////////////////        DATA
  2.     if (!index.isValid()) {
  3.         return QVariant();
  4.     }
  5.     if (index.row() >= romCount || index.row() < 0 ) {
  6.         return QVariant();
  7.     }
  8.  
  9.     if (role == Qt::TextAlignmentRole) {
  10.         if (index.column() > 0 && index.column() < 10) {
  11.             return  Qt::AlignHCenter;
  12.         }
  13.  
  14.     }
  15.     if (role == Qt::UserRole) {
  16.         if (index.column() == 0) {
  17.             return QString("%1;%2;%3").arg(ROMs.at(index.row()).at(12)).arg(ROMs.at(index.row()).at(14)).arg(ROMs.at(index.row()).at(15));
  18.         }
  19.         if (index.column() == 3) {
  20.             ROMs.at(index.row()).at(11);
  21.         }
  22.  
  23.     }
  24.     if (role == Qt::DecorationRole) {
  25.         if (index.column() == 0) {
  26.             return romicon;
  27.         }
  28.         if (index.column() == 2) {
  29.             return QPixmap(QString("Skin/%1/icons/sys/rate%1.png").arg(CurrSkin));
  30.         }
  31.  
  32.     }
  33.     if (role == Qt::DisplayRole) {
  34.         if (index.column() == 0) {
  35.             return  ROMs.at(index.row()).at(0);
  36.         }
  37.         if (index.column() == 3) {
  38.             if (ROMs.at(index.row()).at(3) != "rsnull") {
  39.             return  ROMs.at(index.row()).at(3);
  40.               } else {
  41.                 return cEmulator;
  42.               }
  43.         }
  44.         if (index.column() == 4) {
  45.             return  ROMs.at(index.row()).at(4);
  46.         }
  47.         if (index.column() == 5) {
  48.             return  ROMs.at(index.row()).at(5);
  49.         }
  50.         if (index.column() == 6) {
  51.             return  ROMs.at(index.row()).at(6);
  52.         }
  53.         if (index.column() == 7) {
  54.             return  ROMs.at(index.row()).at(7);
  55.         }
  56.         if (index.column() == 8) {
  57.             return  ROMs.at(index.row()).at(8);
  58.         }
  59.         if (index.column() == 9) {
  60.             return  ROMs.at(index.row()).at(9);
  61.         }
  62.         if (index.column() == 11) {
  63.             return  ROMs.at(index.row()).at(10);
  64.         }
  65.  
  66.     }
  67.  
  68.     return QVariant();
  69. }
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I suposse will discover what is fast and what is slow in qt with the time, and programmng wit it