How to make light speed agent go away

If you mean LightSpeed Agent on an older Mac, I’d first check whether it was installed by a school or organization, since it may be managed software. If it’s your own device, check System Settings > General > Device Management for any profile controlling it, then remove the software through its official uninstaller if available.

As asked in post #2, is this a Macintosh computer application? If so, that is very old. I was still in High School in 1984 and most programs/applications would not likely have been active since then. Do tell.....??

If this is a machine owned by a school or employer do not try to force it off because a management profile will usually put it straight back and you could breach their rules. If it is your own machine start by checking for a management profile in system settings and removing that first or any normal uninstall will not stick. Then look in your login items and the launch agent and launch daemon folders for anything tied to the agent and remove those entries. Restart and check whether it comes back after a reboot because a return usually points to a profile or a reinstall script rather than a leftover file. If you are unsure which entries are safe to delete list the exact names you find here and someone can help you sort the real ones from the system ones.

If it's your machine, get it removed by the company or school.

If not then Linux is your only hope.