Showing up ten minutes early is a speech you give without saying a word.

Arriving before you need to says a set of things you would sound ridiculous saying out loud: this matters to me, I planned for it, your time is not something I gamble with. It also changes what you are able to do, because you walk in settled rather than arriving mid-sentence. The margin is the message.

Build the ten minutes into the plan rather than trying to find them at the last moment. Use them on something small: reading the room, setting up, talking to whoever else came early. Those conversations before the start are often the useful part.