diff --git a/src/loadGadget.cpp b/src/loadGadget.cpp
index 9a9f165..0a5a0f0 100644
--- a/src/loadGadget.cpp
+++ b/src/loadGadget.cpp
@@ -248,7 +248,7 @@ SimuData *CosmoTool::loadGadgetMulti(const char *fname, int id,
     try
       {
         ENSURE("POS ");
-	f->beginCheckpoint();
+	f->beginCheckpoint(true); // Use more memory but faster I/O
         if (f->getBlockSize() != NumPart*float_size*3) {
           // Check that single would work
           if (f->getBlockSize() == NumPart*sizeof(float)*3) {
@@ -299,7 +299,7 @@ SimuData *CosmoTool::loadGadgetMulti(const char *fname, int id,
     try
       {
         ENSURE("VEL ");
-	f->beginCheckpoint();
+	f->beginCheckpoint(true);
 	for(int k = 0, p = 0; k < 6; k++) {
 	  for(int n = 0; n < h.npart[k]; n++) {
 	    // THIS IS GADGET 1
@@ -343,7 +343,7 @@ SimuData *CosmoTool::loadGadgetMulti(const char *fname, int id,
           throw InvalidUnformattedAccess();
         }
 
-	f->beginCheckpoint();
+	f->beginCheckpoint(true);
 	data->Id = new int64_t[data->NumPart];
 	if (data->Id == 0)
 	  {