Troubleshoot/ Tune Android performance / speed I have a Motorola Xoom (not rooted) and new to the Android world (at least as an advanced user). 

I've installed several (around 30) games + several (around 30) apps. I've noticed that it became a lot more slow. Actually browsers can barely work (they hang from time to time). I noticed that several games and apps have active daemons running. 

I wanted to: 


Track the apps that are being used. 
Track the apps that are loaded on startup (and eventually change it). 
Do anything to improve performance


TL:DR; I want to troubleshoot / tune my Android installation. 

Is there any application for that?

Is there any document recommended for this? (I'm an advanced user - developer)

Thanks!
There are a bunch of Tutorials around on the net on how to increase performance of your Android device (e.g. on LifeHackers here and here). One thing to definitely keep your fingers AWAY from are so-called "boosters" and (automated) Task-Killers. As rm-vanda already stated, they make things only worse; tasks should only be killed if they misbehave (e.g. are hanging, running havoc while eating your CPU and the like). Android manages its RAM fine, no need to worry about that.

As for the auto-starters, I can recommend AutoRun Manager, which is actively maintained and simply the best of all I tried (and I tried a lot).

To figure out what is consuming your ressources, a good candidate helping you would be System Tuner. While the free version simply lets you monitor activity life, the pro-version also offers background-monitoring and stores its data for later analysis.

Some other steps you could perform include:


from time to time, clean up caches (to remove old data and get back precious internal memory; helping apps in this segment include Cache Clear, Quick Cache Cleaner, CacheCleaner NG, and Android System Cleaner - the latter taking care for more things than just cache
Moving some rarely used Apps to SD (if they don't have widgets you are using) saves additional internal space.
uninstall unused apps