WA has an effect, not great, but it depends on what themes you use and what options you select. Ilauncher probably a bit, again, depends on what portions you use. Deselect those things you don't need/use. Pocket Weather - YES. I had that (even on just a tab of pocket plus at times) as well as by itself, took forever to soft-reset. Pocketbreeze - no. Voice Command, perhaps a bit, but it's worth it
Just to clarify, I use a 6700, but WM is WM... Although I'll be using a 700wx soon