diff --git a/src/DLListDelegate.h b/src/DLListDelegate.h
index 871b5bfb5..52ecb9c94 100644
--- a/src/DLListDelegate.h
+++ b/src/DLListDelegate.h
@@ -51,7 +51,6 @@ class DLListDelegate: public QItemDelegate {
     ~DLListDelegate(){}
 
     void paint(QPainter * painter, const QStyleOptionViewItem & option, const QModelIndex & index) const{
-      char tmp[MAX_CHAR_TMP];
       QStyleOptionViewItemV2 opt = QItemDelegate::setOptions(index, option);
       switch(index.column()){
         case SIZE:
@@ -65,25 +64,21 @@ class DLListDelegate: public QItemDelegate {
         case UPSPEED:
         case DLSPEED:{
           QItemDelegate::drawBackground(painter, opt, index);
-          float speed = index.data().toDouble();
-          snprintf(tmp, MAX_CHAR_TMP, "%.1f", speed/1024.);
-          QItemDelegate::drawDisplay(painter, opt, opt.rect, QString::fromUtf8(tmp)+QString::fromUtf8(" ")+tr("KiB/s"));
+          double speed = index.data().toDouble();
+          QItemDelegate::drawDisplay(painter, opt, opt.rect, QString(QByteArray::number(speed/1024., 'f', 1))+QString::fromUtf8(" ")+tr("KiB/s"));
           break;
         }
         case RATIO:{
           QItemDelegate::drawBackground(painter, opt, index);
-          float ratio = index.data().toDouble();
-          snprintf(tmp, MAX_CHAR_TMP, "%.1f", ratio);
-          QItemDelegate::drawDisplay(painter, opt, opt.rect, QString::fromUtf8(tmp));
+          double ratio = index.data().toDouble();
+          QItemDelegate::drawDisplay(painter, opt, opt.rect, QString(QByteArray::number(ratio, 'f', 1)));
           break;
         }
         case PROGRESS:{
           QStyleOptionProgressBarV2 newopt;
-          float progress;
-          progress = index.data().toDouble()*100.;
-          snprintf(tmp, MAX_CHAR_TMP, "%.1f", progress);
+          double progress = index.data().toDouble()*100.;
           newopt.rect = opt.rect;
-          newopt.text = QString::fromUtf8(tmp)+QString::fromUtf8("%");
+          newopt.text = QString(QByteArray::number(progress, 'f', 1))+QString::fromUtf8("%");
           newopt.progress = (int)progress;
           newopt.maximum = 100;
           newopt.minimum = 0;
diff --git a/src/FinishedListDelegate.h b/src/FinishedListDelegate.h
index 68881ffb4..dacd4f4a8 100644
--- a/src/FinishedListDelegate.h
+++ b/src/FinishedListDelegate.h
@@ -49,7 +49,6 @@ class FinishedListDelegate: public QItemDelegate {
     ~FinishedListDelegate(){}
 
     void paint(QPainter * painter, const QStyleOptionViewItem & option, const QModelIndex & index) const{
-      char tmp[MAX_CHAR_TMP];
       QStyleOptionViewItemV2 opt = QItemDelegate::setOptions(index, option);
       switch(index.column()){
         case F_SIZE:
@@ -58,25 +57,21 @@ class FinishedListDelegate: public QItemDelegate {
           break;
         case F_UPSPEED:{
           QItemDelegate::drawBackground(painter, opt, index);
-          float speed = index.data().toDouble();
-          snprintf(tmp, MAX_CHAR_TMP, "%.1f", speed/1024.);
-          QItemDelegate::drawDisplay(painter, opt, opt.rect, QString::fromUtf8(tmp)+QString::fromUtf8(" ")+tr("KiB/s"));
+          double speed = index.data().toDouble();
+          QItemDelegate::drawDisplay(painter, opt, opt.rect, QString(QByteArray::number(speed/1024., 'f', 1))+QString::fromUtf8(" ")+tr("KiB/s"));
           break;
         }
         case F_RATIO:{
           QItemDelegate::drawBackground(painter, opt, index);
-          float ratio = index.data().toDouble();
-          snprintf(tmp, MAX_CHAR_TMP, "%.1f", ratio);
-          QItemDelegate::drawDisplay(painter, opt, opt.rect, QString::fromUtf8(tmp));
+          double ratio = index.data().toDouble();
+          QItemDelegate::drawDisplay(painter, opt, opt.rect, QString(QByteArray::number(ratio, 'f', 1)));
           break;
         }
         case F_PROGRESS:{
           QStyleOptionProgressBarV2 newopt;
-          float progress;
-          progress = index.data().toDouble()*100.;
-          snprintf(tmp, MAX_CHAR_TMP, "%.1f", progress);
+          double progress = index.data().toDouble()*100.;
           newopt.rect = opt.rect;
-          newopt.text = QString::fromUtf8(tmp)+QString::fromUtf8("%");
+          newopt.text = QString(QByteArray::number(progress, 'f', 1))+QString::fromUtf8("%");
           newopt.progress = (int)progress;
           newopt.maximum = 100;
           newopt.minimum = 0;
diff --git a/src/GUI.cpp b/src/GUI.cpp
index 297015073..62d33e1b3 100644
--- a/src/GUI.cpp
+++ b/src/GUI.cpp
@@ -1063,14 +1063,9 @@ void GUI::checkConnectionStatus() {
 //   qDebug("Checking connection status");
   // Update Ratio
   downloadingTorrentTab->updateRatio();
-  // Update systemTray
-  char tmp[MAX_CHAR_TMP];
-  char tmp2[MAX_CHAR_TMP];
   // update global informations
-  snprintf(tmp, MAX_CHAR_TMP, "%.1f", BTSession->getPayloadUploadRate()/1024.);
-  snprintf(tmp2, MAX_CHAR_TMP, "%.1f", BTSession->getPayloadDownloadRate()/1024.);
   if(systrayIntegration) {
-    myTrayIcon->setToolTip(QString::fromUtf8("<b>")+tr("qBittorrent")+QString::fromUtf8("</b><br>")+tr("DL speed: %1 KiB/s", "e.g: Download speed: 10 KiB/s").arg(QString::fromUtf8(tmp2))+QString::fromUtf8("<br>")+tr("UP speed: %1 KiB/s", "e.g: Upload speed: 10 KiB/s").arg(QString::fromUtf8(tmp))); // tray icon
+    myTrayIcon->setToolTip(QString::fromUtf8("<b>")+tr("qBittorrent")+QString::fromUtf8("</b><br>")+tr("DL speed: %1 KiB/s", "e.g: Download speed: 10 KiB/s").arg(QString(QByteArray::number(BTSession->getPayloadDownloadRate()/1024., 'f', 1)))+QString::fromUtf8("<br>")+tr("UP speed: %1 KiB/s", "e.g: Upload speed: 10 KiB/s").arg(QString(QByteArray::number(BTSession->getPayloadUploadRate()/1024., 'f', 1)))); // tray icon
   }
   session_status sessionStatus = BTSession->getSessionStatus();
   if(sessionStatus.has_incoming_connections) {
diff --git a/src/PreviewListDelegate.h b/src/PreviewListDelegate.h
index 135da7c8b..5144afe80 100644
--- a/src/PreviewListDelegate.h
+++ b/src/PreviewListDelegate.h
@@ -46,7 +46,6 @@ class PreviewListDelegate: public QItemDelegate {
 
     void paint(QPainter * painter, const QStyleOptionViewItem & option, const QModelIndex & index) const{
       QStyleOptionViewItemV2 opt = QItemDelegate::setOptions(index, option);
-      char tmp[MAX_CHAR_TMP];
 
       switch(index.column()){
         case SIZE:
@@ -55,10 +54,9 @@ class PreviewListDelegate: public QItemDelegate {
           break;
         case PROGRESS:{
           float progress = index.data().toDouble()*100.;
-          snprintf(tmp, MAX_CHAR_TMP, "%.1f", progress);
           QStyleOptionProgressBarV2 newopt;
           newopt.rect = opt.rect;
-          newopt.text = QString::fromUtf8(tmp)+QString::fromUtf8("%");
+          newopt.text = QString(QByteArray::number(progress, 'f', 1))+QString::fromUtf8("%");
           newopt.progress = (int)progress;
           newopt.maximum = 100;
           newopt.minimum = 0;
diff --git a/src/PropListDelegate.h b/src/PropListDelegate.h
index 8268c1602..a4202ca08 100644
--- a/src/PropListDelegate.h
+++ b/src/PropListDelegate.h
@@ -58,7 +58,6 @@ class PropListDelegate: public QItemDelegate {
     ~PropListDelegate(){}
 
     void paint(QPainter * painter, const QStyleOptionViewItem & option, const QModelIndex & index) const{
-      char tmp[MAX_CHAR_TMP];
       QStyleOptionViewItemV2 opt = QItemDelegate::setOptions(index, option);
       QPalette::ColorGroup cg = option.state & QStyle::State_Enabled ? QPalette::Normal : QPalette::Disabled;
       switch(index.column()){
@@ -69,9 +68,8 @@ class PropListDelegate: public QItemDelegate {
         case PROGRESS:{
           QStyleOptionProgressBarV2 newopt;
           float progress = index.data().toDouble()*100.;
-          snprintf(tmp, MAX_CHAR_TMP, "%.1f", progress);
           newopt.rect = opt.rect;
-          newopt.text = QString::fromUtf8(tmp)+QString::fromUtf8("%");
+          newopt.text = QString(QByteArray::number(progress, 'f', 1))+QString::fromUtf8("%");
           newopt.progress = (int)progress;
           newopt.maximum = 100;
           newopt.minimum = 0;
diff --git a/src/downloadingTorrents.cpp b/src/downloadingTorrents.cpp
index de6aa79a3..ec69885e2 100644
--- a/src/downloadingTorrents.cpp
+++ b/src/downloadingTorrents.cpp
@@ -307,7 +307,6 @@ QStringList DownloadingTorrents::getSelectedTorrents(bool only_one) const{
 }
 
 void DownloadingTorrents::updateRatio() {
-  char tmp[MAX_CHAR_TMP];
   // Update ratio info
   float ratio = 1.;
   session_status sessionStatus = BTSession->getSessionStatus();
@@ -321,8 +320,7 @@ void DownloadingTorrents::updateRatio() {
     if(ratio > 10.)
       ratio = 10.;
   }
-  snprintf(tmp, MAX_CHAR_TMP, "%.1f", ratio);
-  LCD_Ratio->display(tmp);
+  LCD_Ratio->display(QString(QByteArray::number(ratio, 'f', 1)));
   if(ratio < 0.5) {
     lbl_ratio_icon->setPixmap(QPixmap(QString::fromUtf8(":/Icons/unhappy.png")));
   }else{
@@ -352,14 +350,9 @@ void DownloadingTorrents::sortProgressColumnDelayed() {
 // get information from torrent handles and
 // update download list accordingly
 void DownloadingTorrents::updateDlList() {
-  char tmp[MAX_CHAR_TMP];
-  char tmp2[MAX_CHAR_TMP];
   // update global informations
-  snprintf(tmp, MAX_CHAR_TMP, "%.1f", BTSession->getPayloadUploadRate()/1024.);
-  snprintf(tmp2, MAX_CHAR_TMP, "%.1f", BTSession->getPayloadDownloadRate()/1024.);
-  //BTSession->printPausedTorrents();
-  LCD_UpSpeed->display(QString::fromUtf8(tmp)); // UP LCD
-  LCD_DownSpeed->display(QString::fromUtf8(tmp2)); // DL LCD
+  LCD_UpSpeed->display(QString(QByteArray::number(BTSession->getPayloadUploadRate()/1024., 'f', 1))); // UP LCD
+  LCD_DownSpeed->display(QString(QByteArray::number(BTSession->getPayloadDownloadRate()/1024., 'f', 1))); // DL LCD
   // browse handles
   QStringList unfinishedTorrents = BTSession->getUnfinishedTorrents();
   QString hash;
diff --git a/src/misc.h b/src/misc.h
index 4b46145de..00e5059a0 100644
--- a/src/misc.h
+++ b/src/misc.h
@@ -37,8 +37,6 @@
 #include "qtorrenthandle.h"
 using namespace libtorrent;
 
-#define MAX_CHAR_TMP 128
-
 /*  Miscellaneaous functions that can be useful */
 class misc : public QObject{
  Q_OBJECT
@@ -109,25 +107,22 @@ class misc : public QObject{
     // see http://en.wikipedia.org/wiki/Kilobyte
     // value must be given in bytes
     static QString friendlyUnit(float val) {
-      char tmp[MAX_CHAR_TMP];
       if(val < 0) {
         return tr("Unknown", "Unknown (size)");
       }
       const QString units[4] = {tr("B", "bytes"), tr("KiB", "kibibytes (1024 bytes)"), tr("MiB", "mebibytes (1024 kibibytes)"), tr("GiB", "gibibytes (1024 mibibytes)")};
       for(unsigned int i=0; i<5; ++i) {
         if (val < 1024.) {
-          snprintf(tmp, MAX_CHAR_TMP, "%.1f ", val);
-          return QString::fromUtf8(tmp) + units[i];
+          return QString(QByteArray::number(val, 'f', 1)) + units[i];
         }
         val /= 1024.;
       }
-      snprintf(tmp, MAX_CHAR_TMP, "%.1f ", val);
-      return  QString::fromUtf8(tmp) + tr("TiB", "tebibytes (1024 gibibytes)");
+      return  QString(QByteArray::number(val, 'f', 1)) + tr("TiB", "tebibytes (1024 gibibytes)");
     }
 
     // return qBittorrent config path
     static QString qBittorrentPath() {
-      QString qBtPath = QDir::cleanPath(QDir::homePath()+QDir::separator()+QString::fromUtf8(".qbittorrent") + QDir::separator());
+      QString qBtPath = QDir::homePath()+QDir::separator()+QString::fromUtf8(".qbittorrent") + QDir::separator();
       // Create dir if it does not exist
       if(!QFile::exists(qBtPath)){
         QDir dir(qBtPath);
diff --git a/src/properties_imp.cpp b/src/properties_imp.cpp
index c9122f21c..e2319b5e7 100644
--- a/src/properties_imp.cpp
+++ b/src/properties_imp.cpp
@@ -76,7 +76,6 @@ properties::properties(QWidget *parent, bittorrent *BTSession, QTorrentHandle &h
   //Trackers
   loadTrackers();
   // Session infos
-  char tmp[MAX_CHAR_TMP];
   failed->setText(misc::friendlyUnit(h.total_failed_bytes()));
   upTotal->setText(misc::friendlyUnit(h.total_payload_upload()));
   dlTotal->setText(misc::friendlyUnit(h.total_payload_download()));
@@ -93,8 +92,7 @@ properties::properties(QWidget *parent, bittorrent *BTSession, QTorrentHandle &h
       ratio = 10.;
     }
   }
-  snprintf(tmp, MAX_CHAR_TMP, "%.1f", ratio);
-  shareRatio->setText(tmp);
+  shareRatio->setText(QString(QByteArray::number(ratio, 'f', 1)));
   loadTrackersErrors();
   std::vector<float> fp;
   h.file_progress(fp);