FF already has overhaul, it's name is Firefox Quantum and it was already proven it was faster than Chrome and Edge. Ask yourself are all web sites slower when viewing via Firefox? Is it possible your computer is infected? Are you using the same extensions on both browsers? Which one has access to better extensions? Which one is more customizable? Have you asked yourself why Tor is a modified version from Firefox and not from Chromium instead? Who stands behind Brave browser and who is behind Firefox? Which one has longer tradition? Firefox has numerous features and advantages over other browsers. While browsing speed is important for everyone, I believe what the people behind Firefox are focusing on is truly free, more private and protected access to the internet, for everyone. Less data for companies. More choice for the regular people like you and me. Brave is a for-profit company. They most likely analyze person's net navigation habits and sells that data. From what I read they let the users choose whether they are shown ads or not, but I still wouldn't trust them with my information as I am not for sale.

That being said, browsers are just tools. If you don't care about anything else but speed, take the fastest one and don't look back. Firefox will still be here if you change your mind.

That's the point, while I agree an overhaul was needed, Australis is actually slower than the pre-Australis builds in my experience. The bouncing ball animation is playing like forever.