vmtoolsd 100% CPU with bird6

Hi guys, I noticed that the VM where I have deployed BIRD is having ~5 sec of 100% cpu used by the "vmtoolsd". This started to happened since I introduced a IPv6 peering (full table). I found a discussion where someone was suggesting to set the poll-interval=900 in the 'tools.conf'. I did that but still see the CPU sometime overused. Is there fix for that (I would prefer not to go to bird2.0 yet). Thanks! Andrea