@RichardN900 - of course you can use 720p, can you imagine the developer behind those two projects (720p and -thumb) to make them incompatible one to another
A couple days ago i started to backup and clean the phone to give thumb a try and i have found that my hangs, closings and lagness were due an overcrowded sms history. I tought this was stored "on disk" but it seems not, or that indexes are huge and took too much memory for them. Now i can open any app in 1sec or less, i'm impressed because i had forgotten that feeling. I always kept at least 1 year of messages, about a week ago i erased anything over 6 months and the phone stood laggy and dumb. This time i just kept 3 months and the change is amazing. Also when i was about to install -thumb (it seems i had the repo added some time ago, because is there, but grey) a new CSSU update came up (usually my WiFi is off for months and have no data package on the phone) i let it install just in case. I think both actions may be responsible if there were some cleanup or anything alike when updating CSSU.