It probably is still the most used framework, probably by quite a margin. Whilst I mostly use Http4s these days I would guess the majority of new projects still pick Play. I would say 60% but would not be surprised if the actual number is 95%.

The silent majority just need to chuck out another internal app quickly and Play is great for that.

It also looks like it is still heavily developed as 2.9 is released soon.

As for performance, shrug.