I have an old Gateway NE71B with AMD Dual-Core Processor E1-1200 running Xubuntu 18.04. It has gotten quite slow even when entering text into a browser search bar. I was using chromium and the browser would raise CPU usage up near 100%. Firefox does the same. I downloaded Midori and it also seems to drive cpu usage at times up to 100%. Is there some way to get it to work. I did notice that when I upgraded to Ubuntu 18.04 the system got really slow but the change to Xubuntu was enough to get it working OK so it is probably a borderline situation. Maybe updates have pushed it too far. If there is not a fix woul;d another flavor of Linux help?
ubuntu-support-status
to assess the security status of your actual install. Your question is still on-topic here, but consider how much security matters to you and the results of prior command. You're now using Ubuntu 18.04 LTS with Xfce (not Xubuntu).