NodeJS load the app on the memory and execute it for every request.
PHP load the app on memory for each request. That makes NodeJS faster. But there're some tools to server PHP apps from the memory, but since the PHP community doesn't do that a lot, you need to watch for memory leaks because package developers assume that the memory will be freed after each request.
With that approach you will find out PHP is faster than NodeJS.
For me, I don't care about scaling HTTP layer since mostly the app will hit database limit before that, then team management, then amenability, etc. it's hard to hit HTTP limit even with PHP loads the app in memory for each request.
