What slows your Windows laptop down the most?

I’m launching Optime here on November 2nd. It’s a tray app that quietly manages background programs, startup apps and services so your laptop stays fast, and explains every action in plain English.

Before launch, I’m curious: what’s the one thing that makes your Windows laptop feel slow? Updaters, browser tabs, startup clutter, something else? I’d love to hear, and I’ll check whether Optime handles it.