Irrlicht Engine

I have version 1.1 of Irrlicht. Vb.net 2003 1.1 framework with dx9 I have had it for awhile now and just started using it again. I converted the terrain sample, it works great but my cpu goes to 100%, as soon as I end it I drop right back down to like 2% or 4%. The terrain c++ sample runs at 100% al...