Nick's computer has been really slow when he's online. Leo says that almost always, you can point to a failing spinning hard drive as the culprit. Generally, the best recommendation is to take the spinning drive out and replace it with a solid-state drive (SSD). It's usually a simple thing to do, but it depends on your computer or laptop. It's also pretty cheap to do at around $100. Another thing to try is to backup your data and reinstall everything, formatting the hard drive. That will certainly eliminate what Leo calls "Kruft," that causes the computer to slow down.
But if it's just the browser, you could try resetting your browser. But try updating the browser as well. Leo likes Microsoft's new EDGE browser. It's pretty fast.