diff --git a/DQM/SiPixelMonitorCluster/interface/SiPixelClusterSource.h b/DQM/SiPixelMonitorCluster/interface/SiPixelClusterSource.h
index 71466918e2d8a..1261542faef2a 100644
--- a/DQM/SiPixelMonitorCluster/interface/SiPixelClusterSource.h
+++ b/DQM/SiPixelMonitorCluster/interface/SiPixelClusterSource.h
@@ -112,8 +112,8 @@
        int noOfLayers;
        int noOfDisks;
 
-       void getrococcupancy(DetId detId,const edm::DetSetVector<PixelDigi> diginp,const TrackerTopology* const tTopo,
-			    std::vector<MonitorElement*> meinput);
+       void getrococcupancy(DetId detId,const edm::DetSetVector<PixelDigi> & diginp,const TrackerTopology* const tTopo,
+			    std::vector<MonitorElement*> const & meinput);
        void getrococcupancye(DetId detId,const edmNew::DetSetVector<SiPixelCluster> & clustColl, const TrackerTopology* const pTT,
 			     edm::ESHandle<TrackerGeometry> pDD,MonitorElement* meinput);
 
diff --git a/DQM/SiPixelMonitorCluster/src/SiPixelClusterSource.cc b/DQM/SiPixelMonitorCluster/src/SiPixelClusterSource.cc
index 0820c2a195243..aff9cb0d5ee37 100644
--- a/DQM/SiPixelMonitorCluster/src/SiPixelClusterSource.cc
+++ b/DQM/SiPixelMonitorCluster/src/SiPixelClusterSource.cc
@@ -425,8 +425,8 @@ void SiPixelClusterSource::bookMEs(DQMStore::IBooker & iBooker, const edm::Event
 
 }
 
-void SiPixelClusterSource::getrococcupancy(DetId detId,const edm::DetSetVector<PixelDigi> diginp,const TrackerTopology* const tTopo,
-					   std::vector<MonitorElement*> meinput) {
+void SiPixelClusterSource::getrococcupancy(DetId detId,const edm::DetSetVector<PixelDigi> & diginp,const TrackerTopology* const tTopo,
+					   std::vector<MonitorElement*> const & meinput) {
   
   edm::DetSetVector<PixelDigi>::const_iterator ipxsearch = diginp.find(detId);
   if( ipxsearch != diginp.end() ) {
diff --git a/DQM/SiPixelMonitorTrack/interface/SiPixelTrackResidualSource.h b/DQM/SiPixelMonitorTrack/interface/SiPixelTrackResidualSource.h
index f79639b396a53..9af0aafac7d81 100644
--- a/DQM/SiPixelMonitorTrack/interface/SiPixelTrackResidualSource.h
+++ b/DQM/SiPixelMonitorTrack/interface/SiPixelTrackResidualSource.h
@@ -54,7 +54,7 @@ class SiPixelTrackResidualSource : public DQMEDAnalyzer {
     virtual void dqmBeginRun(const edm::Run& r, edm::EventSetup const& iSetup) override;
     virtual void bookHistograms(DQMStore::IBooker &, edm::Run const &, edm::EventSetup const &) override;
     virtual void analyze(const edm::Event&, const edm::EventSetup&) override;
-    void getrococcupancy(DetId detId,const edm::DetSetVector<PixelDigi> diginp,const TrackerTopology* const tTopo,std::vector<MonitorElement*> meinput);
+    void getrococcupancy(DetId detId,const edm::DetSetVector<PixelDigi> & diginp,const TrackerTopology* const tTopo,std::vector<MonitorElement*> meinput);
     void triplets(double x1,double y1,double z1,double x2,double y2,double z2,double x3,double y3,double z3,
                   double ptsig, double & dc,double & dz, double kap); 
 
diff --git a/DQM/SiPixelMonitorTrack/src/SiPixelTrackResidualSource.cc b/DQM/SiPixelMonitorTrack/src/SiPixelTrackResidualSource.cc
index 64657d3161e7a..ece3062a596f6 100644
--- a/DQM/SiPixelMonitorTrack/src/SiPixelTrackResidualSource.cc
+++ b/DQM/SiPixelMonitorTrack/src/SiPixelTrackResidualSource.cc
@@ -969,7 +969,7 @@ void SiPixelTrackResidualSource::analyze(const edm::Event& iEvent, const edm::Ev
   // get digis
   edm::Handle< edm::DetSetVector<PixelDigi> >  digiinput;
   iEvent.getByToken( digisrcToken_, digiinput );
-  const edm::DetSetVector<PixelDigi> diginp = *(digiinput.product());
+  edm::DetSetVector<PixelDigi> const & diginp = *(digiinput.product());
   
 
   std::set<SiPixelCluster> clusterSet;
@@ -1448,7 +1448,7 @@ void SiPixelTrackResidualSource::analyze(const edm::Event& iEvent, const edm::Ev
   if(fpixtracks>0)(meNofTracks_)->Fill(3,fpixtracks);
 }
 
-void SiPixelTrackResidualSource::getrococcupancy(DetId detId,const edm::DetSetVector<PixelDigi> diginp,const TrackerTopology* tTopo,std::vector<MonitorElement*> meinput) {
+void SiPixelTrackResidualSource::getrococcupancy(DetId detId,const edm::DetSetVector<PixelDigi> & diginp,const TrackerTopology* tTopo,std::vector<MonitorElement*> meinput) {
 
   edm::DetSetVector<PixelDigi>::const_iterator ipxsearch = diginp.find(detId);
   if( ipxsearch != diginp.end() ) {
diff --git a/DQM/SiStripMonitorTrack/src/SiStripMonitorTrack.cc b/DQM/SiStripMonitorTrack/src/SiStripMonitorTrack.cc
index 8f5780b9384b5..ecbd202180388 100755
--- a/DQM/SiStripMonitorTrack/src/SiStripMonitorTrack.cc
+++ b/DQM/SiStripMonitorTrack/src/SiStripMonitorTrack.cc
@@ -1010,6 +1010,7 @@ template <class T> void SiStripMonitorTrack::RecHitInfo(const T* tkrecHit, Local
       <<"\n\t\tRecHit in GP "<<tkgeom_->idToDet(tkrecHit->geographicalId())->surface().toGlobal(tkrecHit->localPosition())
       <<"\n\t\tRecHit trackLocal vector "<<LV.x() << " " << LV.y() << " " << LV.z() <<std::endl;
 
+    // FIXME: MOVE ALL THE EV AND ES ACCESS OUTSIDE THE LOOP!!!!
 
     //Retrieve tracker topology from geometry
     edm::ESHandle<TrackerTopology> tTopoHandle;
@@ -1029,7 +1030,7 @@ template <class T> void SiStripMonitorTrack::RecHitInfo(const T* tkrecHit, Local
     if (Digi_On_)
       ev.getByToken( digiToken_, digihandle );
     const edm::DetSetVector<SiStripDigi> dummy;
-    auto digilist = ( digihandle.isValid() ? *digihandle : dummy );
+    auto const & digilist = ( digihandle.isValid() ? *digihandle : dummy );
 
     //Get SiStripCluster from SiStripRecHit
     if ( tkrecHit != NULL ){