@Riot what is the thought process on auto attack projectile speed for ranged champions?
Some ranged autos are near instantaneous

Some are not too fast and not too slow

And some are incredibly slow and delayed

Some ranged autos are near instantaneous

Some are not too fast and not too slow

And some are incredibly slow and delayed

Some ranged autos are near instantaneous
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They actually don't even have projectiles for their basic attacks.
Which I love since it is like A LIGHTNING BOLT!
The ones for Karthus and Azir make sense to me. Azir is supposed to build attack speed, and it carries over to his soldiers' attacks, which more or less act like mini Jarvan Qs. The lack of travel time on those attacks is carried back up the chain to Azir's autos so it stays consistent.
Karthus is pretty much supposed to use Q instead of autos for last-hitting. He's been dead for so long, and has focused so much on spiritual/magical/deathly energies so much that his physical attack has become both weak and sluggish. Being (un)dead, he doesn't have to hurry to do anything, and this is reflected in his animations, including his auto-attacks.