I can't be bothered with processes and tuning. The benefits are negligible anyway in my experience. I don't mind cutting back a few services that'll never get used, but that's it.
In XP on my setups there is absolutely no difference between tuning and not doing so, so I haven't bothered for years. It's a fruitless exercise in my opinion, and just leads to more time spent than time saved. The only thing 'tuned' recently, is the PerfectDisk installer, which I edited to exclude the services starting automatically.. that's it.
Bear in mind this rig is loaded with everything I own - I don't install as things are needed, I install in bulk, so if I need something, it's ready.