For Portsmouth, as well as Cityfibre (which Toob in Pompey is hanging off along with some other altnet ISPs) and like Gosport, Portsmouth has had NTL through to Virgin, Cable for decades and both are on their fastest tier now.
Portsmouth also has had a lot of business fibre 1gb+ for a good decade too.
Like Gosport, the dsl has generally been around the 40-80 mark for sometime in Pompey, its rare to find any street with a low connection 10-30 dsl.
By the way for me, the Openreach fibre postcode checker still says 'Build planned between now and Dec-2026'. That is the one you can register, I did, so far no email, hopeless, seeming as I've ordered.
Speaking with people all over my Town, looks like a lot of the Town went live this week and is now available to order too.
Most of Fareham and Stubbington have had full OR fibre available for at least a year and Fareham live with a little bit of Toob in the North and North East. Still a lot of work going on there for Toob, that has been going on since beginning of last year.