Your2ndPlace

I really hope this is not going to turn out as a which hunt. Nor into another reason to say a lot of ungly words addressed to LL. Any system has its limitations, it is nice to have a tool to know how much resources we use.

About those textures and alpha channels.... No, you don't have to use 512x512 textures for everything you build. Some things look perfectly well with significantly smaller textures and 128x128 loads 16 times faster. That's where masters of the art are recognized. And that edge line shows up after a clumsy job on alpha channel, when creator miss to delete those few almost invisible pixels near the edge. Or when flat object (a box prim with one side almost zero) that has all six sides textured. Unlike 3D modeling software, SL doesn't support planes, so we use boxes with one side thin as possible. But that "thin as possible" is not zero. So make that's side's texture fully transparent by applying the transparent texture, not by setting its transparency in edit window.