Below 10px radius, all programs take under 0.5 seconds, so you don't even notice the difference. The picture in an example was made with a radius about 12px. B

Below 10px radius, all programs take under 0.5 seconds, so you don't even notice the difference. The picture in an example was made with a radius about 12px. But Photoshop and GIMP allow larger radii, so I think large radii are used sometimes, too. BTW. it really surprised me, that Adobe Photoshop uses such a simple algorithm, while faster (and slightly more complex) algorithms exist for quite a long time.