SolidJS is currently faster at runtime. Not sure it could beat Svelte at developer time. And with the reported speed improvements in Svelte 5 (waiting to see how those bear out in the real world), the difference isn't going to be how fast in runs in your browser; it'll be how fast you can go from a blank IDE text window to a user's browser.

    let features = 0;
    let people = 1;

    $: featuresPerPerson = features / people;

    function addPerson() {
      people++;
    }

    function addFeature() {
      features++;
    }

Folks might consider it magic, but it's a lot closer to our mental model of the problem than anything SolidJS can give. As for "magic", we're working with sand we shot with lightning to make it think. If you don't like magic, you're in the wrong vocation. The only question is whether or not the magic is useful, predictable, and reliable. I consider Svelte to be that right kind of magic.