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I have feature with a big amount of vertices. But these vertices are totally useless and make Qgis editing too slow. Lets look on image with example:
These vertices inside of black line I want to delete. But I want to preserve shape of red line as well. So I need to let vertex outside of black lines.
Vector -> Geomtry Tools -> Simplify Geometries. You have to experiment with the tolerance though...
Otherwise you can make a custom script that checks if the azimuth of two concecutive segments is the same and in that case to delete the middle vertex.
