[Asus Transformer TF700] Anders Williams:
So after having been testing this ROM since 5.0.X beta 2 I think, and having seen how well it has been working I decided to test a few different setups to try and see how to extend battery life without sacrificing too much performance for day to day tasks.

As [MENTION=518363]sbdags[/MENTION] commented earlier, running without the GPU options set dramatically prolongs battery life for the device without really any noticeable performance drop while in standard display situations, if you run a 3D game the GPU will be doing your rendering for you anyways so there should be no drop there., the only place I can envision an actual drop are apps where some sort of high cpu usage in combination with large textures are in play, aka where you actually see high CPU load due to whatever and the GPU can relieve the CPU a little, however the battery cost for this seems quite excessive for very little performance., so this is a first step, this in my experience buys you about 2-3 hours of extra battery time depending on your usage of the device.

Second, overclocking has a cost, yes you see a slightly more responsive device when overclocking, but in my experience not using apps that are currently "high-end" apps but rather sticking with basic Google Play apps, a few readers, Netflix and a few others I see near zero performance enhancements from overclocking, rather I have been running with a clockspeed at 1,4 GHZ as of late with decent results.

FInally and this is the big one for me, do you really need WIFI to be enabled when the device is in sleep mode? This is where I earned a massive leap of standby time (and some stability, will come back to that) personally I use my tablet for reading news and kindle books, writing/reading some emails, netflix/chromecast remote, SONOS remote, XDA app reading and similar, I do not actually use it for notifications, rather I have actually always turned off notifications on my device as I use my phone for such things. So when I thought about it, I didn't really need the device to keep a persistent WIFI connection when it went into deep-sleep, after having disabled this under wifi settings, I am not seeing close to a week of standby time (unless I use it screen/wifi on ofc) meaning I am not seeing a dead tablet at the end of each day form just sitting there notifying my cat that there is an email in Gmail or that Netflix now has "Orange is the New Black" season 3 is out on push notification.

The other thing I saw after having disabled WIFI during sleep, is zero black screen of death, and I mean zero. I noticed this back a while ago that whenever I put my device in airplane-mode it seemed to be much more responsive than when at home and suspected the WIFI driver/transmitter to have some serious issues in terms of its connectivity with what is to say the least, a pretty poor I/O element of the device. So it appears that there is some sort of link here at least. I can't say 100% sure that this is the miracle cure for everyone, but for me at least it has brought the tablet to a pretty decent state of operations.

Having said all this, there are drawback to WIFI being disabled during sleep ofc, my own personal annoyance is the lack of automated backups to my cloud drive with Titanium Backup, currently toying around with Tasker to see if I can create a profile to create an "awake state" during the backup window.

Hope this helps some of you out there.