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[profit]

Can you look at what is causing the slowdown when large area's of ramps or smoothing jobs are designated. 

Large area's of stones can be set to be mined without the massive slowdown(even when reveled), so there must be something different about those two options.

[Amalgam]

Yeah, I've noticed that too. I thought I was forcing dwarves to repath for a while but I caught on eventually. I know when you mine or carve ramps from walls it can cause ramps to be marooned, and thus removed, I think whatever checks DF performs to remove ramps might be the culprit. Might be the result of some hack by Toady, I think the automatic removal of free-standing ramps is a relatively recent thing...

[Bricks]

I think it's because it's very easy for the game to determine whether a section of wall is accessible or not, and then determine what jobs to assign, but when you designate smoothing, the game has to calculate the distance for every spot, since each one has to be at least exposed to open air.  There is a probably a workaround, or at least some way to approximate it faster and assign jobs less efficiently.