This is exciting. Glad to know they're focusing on making a stable, secure protocol, and that development is going strong. Great job and keep up the great work!
As far as we know, we have addressed all known issues in the original algorithm - which is why we have declared ourselves out of beta. Matrix 1.0 has an entirely new state resolution alg, as well as many other security fixes.
Performancewise there are still issues, but we know what needs to be done to fix them, and this will be landing shortly now 1.0 is out.