These benchmarks miss the point in my opinion. When I'm choosing a terminal emulator, beyond features, the one "performance" metric that I'm interested in is latency; nothing else really affects my workflow (positively or negatively). In the benchmarks I've seen of alacritty wrt latency[1][2], it doesn't come out so well.
[1]: https://danluu.com/term-latency/
[2]: https://lwn.net/Articles/751763/