I'm willing to pay the "performance tax" of the web stack/self-hosting if it means my design files aren't held hostage in a proprietary cloud silo.

Figma is fantastic software, but it has become a single point of failure for entire product orgs. If Penpot is "laggy" right now but gives me a docker-compose up guarantee that I own the pipeline, that's a trade-off I'll take.

Performance can be optimized eventually (it's code); closed-source licensing terms cannot be optimized by users (it's legal).