My VPS (Ubuntu 22.04, XFCE, 4 CPU / 16GB RAM) is Extremely Slow – Even Idle

I’m using a VPS with Ubuntu 22.04 and XFCE desktop (4 vCPU, 16GB RAM). But it's extremely slow — even when idle, opening a browser or switching tabs takes 10–15 seconds. I tried killing all processes and using htop, but nothing is eating resources. Time inside the VPS also lags. Is this a system misconfiguration or could it be an issue with the host node? Any advice would be appreciated. Thanks!