Default "Rebuild with hole lines" to on in Dash RED

[GooberRF]

I know of no negative to this option, and it only does something when a map has holes. New mappers sometimes don't know about this option, so have no way to track down holes in their maps. Option is under "level" menu, should be defaulted to on rather than off as it is in stock RED.

[rafalh]

Does it slow downs the editor?

[GooberRF]

Does it slow downs the editor?

I've never noticed any associated slowdowns. I guess any additional calculations/line draws will always technically impact performance, but at least in my experience it's been negligible in every single case.