Imperceptible with a controller on TV (as compared to an Xbox One on the same TV, which has a decent amount of input lag already).

On Chrome on PC with a low-latency gaming monitor, you can notice the difference if you play a game natively and then stream it, but honestly you stop thinking about it pretty quickly as long as your ping is under ~25 ms or so. I'm loving Cyberpunk on Stadia and I've been playing shooters on PC since MoH:AA in 2002.

Edit: I have Comcast Cable, not fiber.

To contradict sibling, I don't notice any latency on 75 mbps plan (might be a lack of sensitivity to that as someone who hasn't gamed in years)

This is a question that has two answers

1. Not good

2. I have fiber

Obviously generalization and I don’t care if someone has 2008 DSL and it “runs awesome”.

2. I have fiber and I'm close to a Stadia datacenter.*

I assume they don't release in markets that aren't physically close to the hardware though - it's not available at all here in New Zealand for example.

Fiber wouldn't do much would it? Does it reduce actual travel time for the signal?

Depends a lot what you compare fiber to.

mobile broadband can easily have 20-30 ms latency to the ISP.

DSL is often 10-20 ms. Coax is in the same range, depending ont he provider.

Fiber is usually 1-3 ms.

You do not seem to live in a rural area.

I don't understand why rural is relevant to the latency I posted?

Very anecdotal but I just switched from cable to fibre and latency significantly reduced, form like 20-30ms to 5ms.