What is a normal load for ndsd on linux when you have 10 servers ?

I'm used to our netware servers averaging an amazing 2-5% load during peak hours but since we migrated to OES on SLES I'm seeing ndsd averaging with 20-30% load (on 1 core) with spikes going up to 50%
Every now and then it'll drop to ~5% but it'll just stay there for 5 to 10 seconds and then go up again.
I'm not really sure at what point this started happening, but we've done some OES upgrades and added DSFW servers in a very short period.