message: change limit block from 500 to 5
  due to data transfer is too large during beginning and users feel is unresponsive.
diff: @@ -6244,7 +6244,7 @@ bool static ProcessMessage(CNode *pfrom, string strCommand, CDataStream &vRecv,
  // Send the rest of the chain
  if (pindex)
  pindex = chainActive.Next(pindex);
  - int nLimit = 500;
  + int nLimit = 5;
  // LogPrint("net", "getblocks %d to %s limit %d from peer=%d\n", (pindex ? pindex->nHeight : -1),
  // hashStop.IsNull() ? "end" : hashStop.ToString(), nLimit, pfrom->id);
  for (; pindex; pindex = chainActive.Next(pindex)) {
  