Re: W10M Official 10586.420 Issues (Threshold Branch, Production Ring/Official)
no..i did a clean official windows 10 installation on my L640 XL.
never did a hard reset after that bcz it never needed any..
battery was superb..
even got up to 4 days of usage sometimes.
things changed from this build. why ??
i have no idea.
Great screenshots. Clearly Whatsapp and WindowsCentral are really pinging constantly.
I'd suggest disabling push for *at least* WindowsCentral, and possibly WhatsApp (not sure how this affects it's functionality, it's not one I use for messaging myself).
Your "Device Diagnostics" is really eating your battery too, is that an app that prevents background disable? Apps that constantly check device status can be really tough on CPU/batter.
My guess is that if you look at Data Usage, for the same apps (except possibly Device Diagnostics), you'd see quite a spike since the 420 update (obviously getting the <420 data could be difficult, since you hard reset). Either way, I'd be taking a look at the data usage patterns for those.
I know the WindowsCentral is a pretty high CPU/Data user on my PC, but I don't run it on my phone, so I'm not sure the two necessarily correlate, unless its' a universal app, then I'd definitely be suspicious of it.
I'd also suggest disabling some of your background apps, like the Store, and just check those periodically, but that's me, I like the "manual poll/pull" model for some of these. Edge can be a background CPU/battery suck too, if it's running something that's active, like a weather page.
I know this doesn't answer exactly why 420 transitioned, but this gets you "on firmer ground". Once you get there, you can re-add apps into the background(ONE-at-a-time), and I bet you'll see one of the apps is the culprit, it'll be relatively obvious.
A quick way to "check" this, if you don't want to disable a bunch of apps, is to turn on "battery saver" all the time, since that is "supposed to" prevent all but critical background processing, such as phone and device-text, and a small set of kernel stuff. It's not as good as manually disabling those and re-adding them, but it's easier for a quick check.
After all this, I'd go back and read the release notes for 420, and see what matches. For example, it looks like they fixed quite a few "sync" issues in this build, which would lead back to the various apps mentioned above.
My 420 battery use seems to have gone down to 1-2%/hour if I'm not actively using it, and back to 318 levels, if I am, once I disabled a couple of background apps myself. For now, I'm good with that, as I don't really need Edge running background.
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