There's a very simple solution, stop using task killers; they are completely and utterly pointless on Android.
Android's memory management is NOTHING like Windows Mobile. On there, apps keep running when you "exit" then, and don't close when other apps need their resources. On Android, apps stay in RAM in case you want to reuse them BUT, if something else needs their resources, or they've been inactive too long, Android itself will close them.
If the app is in RAM, odds are something is using it. So if you kill it, whatever is using it has to reload it all over again and that seriously kills your performance.
Stop using the things, seriously. After a couple of days, you'll be glad you did.
Current Devices: Samsung Galaxy Note II (N7100), Acer Iconia Tab A511
Past Devices (too many to list, mostly Acers!)