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[Erk]

I just noticed that designating large areas of upward ramps to dig has caused a solid hit to my already straining FPS, from 45 to 15. Has anyone else spotted this one?

[Scarpa]

That's a common issue with large designations like that in general. It causes 1000's of jobs (one per square designated) to constantly check if a dwarf is available for it. To avoid the FPS hit just do smaller chunks. I typically outline the large area and then do small fill in designations.

[Erk]

I'm aware, but this one is specifically for ramps. I tested it, by designating the area as ramps, watching the FPS drop, and then undesignating and switching to dig. The FPS drop for digging was negligible - it wasn't really that big an area, about 10x15 - but for ramps it's massive.

[Urist Imiknorris]

The game seems to have trouble removing ramps. Since natural ramps are automatically removed when they don't have a wall next to them... Yeah. The lag.

[Shinziril]

Anything with mass channeling/ramping is very bad for FPS, as it has to do several things at once:

Each time a tile is dug, check for cave-ins / ramp collapses.

Each time a tile is dug, recalculate connectivity maps.

Each time a tile is dug, redo the path for the dwarf that was trying to get to a different tile and wanted to walk over the now nonexistent tile (Sigh . . .).

The multiple large calculations necessary per tile means that designated ramps or channels can cripple even a powerful machine if you use too many, bringing your FPS to its knees.  Use sparingly!

[Ampoliros]

Yeah, i've had that too. I presumed it was because of the potentially complicated and shifting nature of the pathing around the ramps and the collapsing ramps thing; you might want to try locking them in/burrowing them, as it might help...I haven't made any very large multi-z-level drops recently, but the smaller ones i've been doing by designating staircases and just chanelling them out top-down. Might help?

[Corona688]

I'm aware, but this one is specifically for ramps. I tested it, by designating the area as ramps, watching the FPS drop, and then undesignating and switching to dig.

With a ramp it's possible for every ramp you designate in a giant flat area to be available to be dug immediately, wheres if you're digging in from the side, most of it probably isn't and ergo isn't checked.  I bet you'd have a similar drop with down stairs, etc.