Eh, at least you have the ETH and EPFL. Germany has... TU München and Uni Saarbrücken? I once met a CS postdoc from Uni Saarbrücken who was (and is) doing interesting stuff - he's a professor in Switzerland now.
Stable Diffusion was developed at LMU München. There's also lots of interesting stuff coming out of RWTH Aachen.
Wondering what specific field of CS you're referring to, I'm seeing a much wider spread (and Saarbrücken does not even ring a bell). I was attending LMU and I have not kept up with the database stuff the last years from there but I feel like they published a lot of stuff.