The reflection problem is back. Snipe at y = 0 and whatever would have been under y = 0 reflects to the top of the world, causing massive lag.

The reflection bug still exists with the blend ball brush, tested some other but they didn't seem to reflect.

EDIT: also reflects when using the 2-d rotate brush

Thanks for reporting. This might "fix itself" once we release VS6. However, we'll have a look into it when we convert the brushes to VS6 API.

Any particular brush doing that?

Will look into the overflowing data.

Just confirmed it.
Also I'm guessing the lag comes from shadow recalculations and 1.3.

Every brush, some brushes cause more lag than others, blend ball is probably the worst.
This used to be a problem back in Pangea but was fixed a while ago, seems to have returned sometime recently.