As you aren't posting code or stats I can't say much, but I'd bet a native app would still be smaller and more efficient, since you have to wrap what you're doing in an entire Chromium instance and deal with a web stack designed for documents, which is definitionally less efficient than a native alternative. Tiles aren't exactly cutting edge technology.
"Heavy processing delegated to webworkers?" That just sounds like threads but worse.
The first post in this subthread was literally a statement that "A web-based solution is usually better performing, despite all the bloatware necessary." And you literally joined in to support that assertion against "the Electron haters."
And it isn't trauma, it's literal fact. Electron isn't used because it's technically superior to native applications, it's used because web devs are a dime a dozen. It's popular for business reasons, not technical reasons. It works "well enough," but only because computers are really fast but there's only so much slack an OS can take up when even parts of it are Electron apps, and probably vibe-coded to boot.
"Heavy processing delegated to webworkers?" That just sounds like threads but worse.