I already put this in "Xperia SP Q&A, Help & Troubleshooting" but I think it's a dev subject.
I'm trying to make a slim ROM starting from stock 207, without BE, sound enhancement, etc.
Using Elixir (Wakelock does not shows everything) I discovered that this apk uses a lot of CPU, it's the champion.
Then I tried to disable all bravia stuff in settings and also in build.prop (swiqi2.enable=false): no effect.
I also deleted /etc/be*. But this process continues to eat cpu all the time, when you watch a video or simply scrowls a list. It seems that it filters the whole video flow.
Last step: freezing SwiqiSettingsService. In this case, video playing becomes very very laggy (totaly unusable, using stock player or Mx gives the same result), BUT the phone becomes so much responsive.
If someone knows how to totaly wipe bravia/swiqi stuff from the phone (or want to investigate that) ... it will be a great improvment for those who don't care about this kind of "enhancement".