Constant Minecraft server lag: "Can't keep up! Is the server overloaded? Running 7454ms or 149 ticks behind"

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    This message keeps popping up every few seconds and the server is always a little laggy, e.g. blocks you just placed disappearing or you taking twice as long to eat. I tried multiple things already, including upgrading the RAM, but that didn't help, it's still always around 80%-90% used.
    This gets worse the more people are online. Any idea how I can fix it?
    And no, I don't have any plugins or mods installed on the server.

    Hello 7000Diamond,


    please ask support for a hardware change. This should minimize your problem. The latest Minecraft versions unfortunately draw a lot of power. Another way to minimize this is to switch to an optimized Minecraft version (Spigot, Paper, Sponge ...)


    With friendly greetings

    xMarcel_x