Comment 1 for bug 1125182

This isn't a bug in xfdesktop4. The reason why other SVG files take longer to load is their complex nature.

There is no good solution for this; either we ship one SVG file that might take longer to load but will work well with all systems or several PNGs exported to multiple sizes (for reasons not sensible to discuss within this bug) which might or might not work well with various systems (due to stretching etc). The latter option will make the wallpaper list longer and that's why it's not the perfect solution either.

Marking this as opinion for shimmer-themes as well, but I'll see if we could do something to improve the situation with future releases.