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Thats weird. I've havent heard of brave slowing down. Do you use a lot of extensions or have an IPFS node running in it? Maybe have Tor turned on inside it? Those can really slow it down especially on launch.
Either way I wish you luck on figuring it out!

I've disabled some extensions, some of which I didn't even need, and it has been fine since then. I'll see what happens if I enable them one at a time.

I don't have Tor or IPFS, but maybe it's another of the extensions. I'll try turning some off. It happens at random, so hard to confirm the problem.