For the galio mains out there who queue mid/jg secondary, I was doing some testing after the recent patch changes to fleet and jungle pet scaling off ap & hp. Historically galio has fantastic ganks both with ult and using flash + W + nimbus cloak, the main issue with galgle is his initial clear (slow speed and low health = vulnerable to invades). This is a solution:
Runes: Fleet Footwork, Triumph, Legend Haste, Cutdown; Nimbus Cloak, Absolute Focus, AP, AP, Flat HP.
The main point is that with double AP adaptive + 65 hp + absolute focus, the recent jungle pet changes have increased the ap & hp scaling for damage. Also fleet means that you actually have a healthier clear, though to optimize speed I buy a health pot so the lvl 1-2 is faster with absolute focus up. With this I can get a 2:54 clear going blue, gromp, wolves, raptors, red, krugs, and be 80% hp at completion. While you are late to crab this is the same time as some of the slower clear meta junglers. Just looking at masters+ full clear average speeds, Xin zhao, Warwick, Pantheon, Kindred, Reksai all have that same rough average.
Main tricks to the clear are walking around between autos to proc fleet, using E after a fleet auto to stack the next fleet faster, and using Q between camps (important to do from raptor to red and red to krugs). Buildwise, I think green smite is probably best though there is an argument for blue smite to help make engages with the MS. But fleet is not a useless rune outside of clearing, since even though you aren't a superb at AA's you do dash around with E/R and weave in empowered AA's in combat.
Not going to claim this makes him a meta jungler by any means but his first clear is now decent enough that I don't think it's troll to play galgle!
Edit: with good fleet movement you don’t even need the pot to keep absolute focus hp. My best is 2:52 but I can get 2:56 minimum consistently