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I ran it with 3040x3040px images on my MacBook M1 Pro in about 9 seconds + 200ms or so for the masking.

Previous SAM v1 you can use e.g. in here:

You just have to wait probably few weeks for the SAM v2 to be available. Hugging Face might also have some offering

It's OSS, so there isn't an "official" hosted version, but someone probably is gonna offer it soon.