I just tested this fix to do sudo ifconfig awdl0 down and my ping times are consistently low.
This is exactly the problem I'm having both with my 10.10 MBP and my iPhones/iPads running iOS8. Glad to hear bringing down awdl0 fixes it, I'm going to try it as well, but it seems there's no solution for non-jailbroken iOS devices yet :(
Here's the weird thing, my devices (both i and MBP) are fine on the work network, so I wonder why they're good there but not at home? I have a decent router (LinkSys E4200) that worked fine pre-iOS8 and 10.10. I have fiddled with the settings on the 2.4 Ghz and 5 Ghz to no avail (though admittedly I haven't tried everything).
Does anyone have any idea why my devices work fine on our work network and not at home? I'd hate to think I need a new router, I know it's not real gear, but it's served it's purpose just fine until this. I know my company at work doesn't allow Bonjour, is there a way to disallow it on my home router too?
You can always use the web interface to set it up, it's just 'easier' for non-technical consumers to use the software.