+++ src/app/virtualbox/src/VBox/Devices/Network/DevE1000.cpp
@@ -5721,22 +5721,29 @@
             rc = g_aE1kRegMap[index].pfnRead(pThis, offReg & 0xFFFFFFFC, index, &u32);
             u32 &= mask;
             //e1kCsLeave(pThis);
+#ifdef DEBUG
             E1kLog2(("%s At %08X read  %s          from %s (%s)\n",
                     pThis->szPrf, offReg, e1kU32toHex(u32, mask, buf), g_aE1kRegMap[index].abbrev, g_aE1kRegMap[index].name));
             Log6(("%s At %08X read  %s          from %s (%s) [UNALIGNED]\n",
                   pThis->szPrf, offReg, e1kU32toHex(u32, mask, buf), g_aE1kRegMap[index].abbrev, g_aE1kRegMap[index].name));
+#endif
             /* Shift back the result. */
             u32 >>= shift;
         }
+#ifdef DEBUG
         else
             E1kLog(("%s At %08X read (%s) attempt from write-only register %s (%s)\n",
                     pThis->szPrf, offReg, e1kU32toHex(u32, mask, buf), g_aE1kRegMap[index].abbrev, g_aE1kRegMap[index].name));
+#endif
+
         if (IOM_SUCCESS(rc))
             STAM_COUNTER_INC(&pThis->aStatRegReads[index]);
     }
+#ifdef DEBUG
     else
         E1kLog(("%s At %08X read (%s) attempt from non-existing register\n",
                 pThis->szPrf, offReg, e1kU32toHex(u32, mask, buf)));
+#endif
 
     memcpy(pv, &u32, cb);
     return rc;