Ethereum performance or not cannot be a hindrance to Bitcoin dominance, bitcoin has gone far beyond all these, ethereum may be creeping for long and still indicating for intending abilities to rise at the course of time, but we can't be comparing the two on each other, as ethereum performance has nothing to do in affecting bitcoin dominance, this is not how it goes if we look more further beyond just what others may be saying.
But in the long term, Ethereum will follow BTC. When BTC rises, it will also rise, just like other altcoins. However, today's question about Ethereum really confuses me. It's not growing and seems to lack any power. It could be said that its people have completely split and migrated to other projects, so Ethereum, once considered a blue chip in the crypto market, has lost its community.
With ETH, we know about altseasons, but currently there's no such altseason, especially if ETH can reach $10,000. That hope is over, with unlimited coin creation.