Would having a crazy amount of devices connected wirelessly to one router cause bad up/download speeds and poor ping?

I live in a shared house and my live-in landlord is crazy for smart devices (14 Alexas). I think it’s something crazy like over 80 devices are connected to one router. I’ve been experiencing terrible down and upload speeds since he’s been adding more and more items, 0.98mps down and over 200 ping as of last test.

Obviously since makes gaming pointless. Just want to confirm this is the case and if there’s anything I could do about it

Thanks