Let me introduce how to improve performance easily.

koa’s concept is really terrific.

I’m sure koa v2 + async/await will be the mainstream in the future. but, I guess someone needs to use koa v1 for various reasons.

co-booster is a performance tuning version of co. It’s fully compatible with co. and, works fastly in many cases.

co is used in a core logic of koa v1 and koa-convert. so, I believe it makes koa better without much effort.

Here are my results using koa’s benchmark script. (100 middlewares)

- koa v1 + nodejs v4.4.7 : 11% better
- koa v1 + nodejs v6.9.1 : 13% better
- koa v2(legacy middleware) + nodejs v4.4.7 : 13% better
- koa v2(legacy middleware) + nodejs v6.9.1 : 14% better

I just wondered what author, contributors, and users think about. I’d like to contribute to koa if I have a chance.

[fengmk2]

Look good, I think co-booster and co merge together will be good choice for the whole co solution.

[juliangruber]

The numbers look good! Since co-booster is fully compatible with co however, what do you think about merging your changes into co instead?