After doing some calculations, I'm disappointed by the rune Celerity

I know the runes are WIP. but it seems like Riot isn't doing much about the rune right now.

Let me show you how weak the rune really is. Our subject for the calculations is full AP Janna.

Janna mid's best build is Morellonomicon, Luden's Echo, Lich Bane, Sorcerer Shoes, Ardent's Censor, and Rabadon's Deathcap.

Adding Sorcerer Shoes movement speed makes Janna's movement speed 365

Janna's kit with Zephyr maxed then adds 57 movement speed to that, making Janna's movement speed 422.

Having Ludens, Lich Bane, and Ardent's movement speed bonus makes Janna's movement speed 526.

Adding all of the items AP together, including Gathering Storm's 60 minute AP of 168, 50 AP from Elixir of Sorcery, and the 22.5 AP from Inspiration + Sorcery makes our AP a total of 945. Zephyr bonus movement speed has an AP ratio of 2% per 100 AP. That would be about 19% bonus movement speed, making Janna's total movement speed now 626.

Including Celerity's bonus movement speed makes Janna's movement speed now 644. This is a pretty good movement speed right? Let's see how much AP we get from Celerity. Subtracting 320 from 644 makes 324, which is our total bonus movement speed. Celerity makes 8% of your bonus movement speed into AP, and that gives us

26 AP

Riot please buff this rune. It's a trap.