I didn't say it would mate
How do you know it's the CPU? It could be any of several of components causing problems, or even an issue with your Windows install.
I've used other browsers same issue. I've also played games, 20 year old ones still get issues. it seems to get bottlenecks easy. I've had previously and never had issues, since get thus cpu there is always something, would never recommend them.
Maybe stop using Chrome? As a quick test, I'm seeing 8%-15% CPU utilisation in Chrome, at idle (HUKD homepage). In Edge (Chromium), it's a tenth of that (0.8%-1.5%). In Firefox, 0%-3%. With Brave Browser, CPU utilisation quickly drops to 0% and stays there. Is this a CPU problem, or a Chrome problem? It's been known for years that the Windows version of Chrome isn't a good browser for laptops and tablets. It's a resource hog that kills battery life.
I'd prefer going with a ryzen 5 and b450 board but this is still a good deal.