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Check https://github.com/spiral/framework - it would satisfy your perf requirements (roadrunner under the hood). We pushed it up to 250k on synthetic hello world, but in real world 20k are achievable without much hassle.
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InfluxDB
Purpose built for real-time analytics at any scale. InfluxDB Platform is powered by columnar analytics, optimized for cost-efficient storage, and built with open data standards.
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framework-x
Framework X – the simple and fast micro framework for building reactive web applications that run anywhere.
Using FrameworkX default hello world example I get 12.4K req/s on my M1. FrameworkX is using ReactPHP. Unless I'm reading activity monitor wrong it's ~10MB idle and 12,5 MB max.
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