Single Surface Vs Sprites

Blitz3D Forums/Blitz3D Programming/Single Surface Vs Sprites

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Just some confused about some things.

When we talk about single surface 'sprites'? Are they actually image sprites or are they single surface quads/tris?

If single surface tris/quads are faster than the native blitz3d sprites, is this because the native sprites are implemented using 2D calls?
or are there other reasons why a single surface is faster than a sprite?