At some point, just about everyone who uses a computer has experienced that frustrating moment when things start to slow down. Your system lags, programs take ages to load and simple tasks like opening a browser or file seem to take an eternity.Here’s the thing: Slowdowns don’t just happen out of nowhere. You might have too many startup apps, background processes hogging resources or a hard drive low on space. It could be as simple as your computer needing a good restart or an overdue update running in the background.Thankfully,…