--- Operating System, Graphics card ---
Linux Fedora 17 64bit Intel, Intel 3000HD gfx card
--- Blender version with error, and version that worked ---
Blender SVN Rev 53856 Debug
--- Short description of error ---
--- Steps for others to reproduce the error (preferably based on attached .blend file) ---
I was testing the Laplacian Smooth Modifier. If I have a subsurf modifier with its effect
visible in edit mode and then add a smooth modifier also with its effect visible in edit mode.
Blender goes extremely slow.
If you try altering the factor value of the smooth modifier by dragging with the mouse it takes
an age to respond. Even though subsurf is only set to 1 for view and render.
If in the subsuf modifier I disable the Use Modifier when in edit mode button the smooth modifier
works at good speed again.
I had attached a blend file setup with the settings which cause it to go slow. Also attached my system-info.txt file.
I am not sure this is a bug, but its slow even with subsurf levels for view and render at 1, which seems very strange.
Description
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It seems this is just a slower tool, it's based on solving a sparse matrix system like unwrapping or automatic weights, which also means it doesn't scale linear with the mesh size. It's not really designed to be used as an interactive modifier that you have enabled all the time.
The fact that it's a subsurf modifier or that this is in editmode doesn't really make a difference, the performance depends only on the number of vertices in the mesh. Perhaps this tool can be optimized further, but it seems the bottleneck is in the matrix solving. We could upgrade to a newer/multithreaded library once but don't see that as a bug.