I would say performance only matters if it's debilitating, outside of that it's something that few notice even fewer care about. Also I guess it can impact first impressions.

But once I'm using a tool for something unless the performance is actually preventing me from using it - I'm not going to bother switching. So no need for a monopoly - if your competitive edge is that you are faster than competition, unless the competition is dog slow it's not a selling point to me.

Eg. I won't look for VS code alternatives just because it's electron based and the competition has higher performance, vscode is fast enough for me. I will switch to a different compiler or even language if it shaves % off buid time that makes the iteration meaningfuly faster, or the tooling addresses pain points.