The 220 kts at PORPA is a PANS-OPS procedure design requirement to reduce the radius of turn and contain the flight path for terrain considerations. Don't overestimate the ability of your FMS to exactly fly the track just coz you're on an RNAV SID. No RF legs in our procedures yet. Controllers shouldn't be cancelling the speed restriction on first contact - unless they want to take responsibility for your terrain clearance. Some smart ones will say "No ATC speed restrictions" or "No speed restriction once you're established southbound". If you want to go faster, then you need to understand the implications.
The recent change in interpretation by ICAO has followed the UK philosophy that once you change frequency and are issued a new descent clearance, all previous requirements/restrictions are automatically cancelled and need reiterating by the next controller if still valid. Personally I think its a crock, made up by people who seem to find ambiguity in anything. It probably doesn't make much difference at MELON if you're already aiming for 130/150 and change frequencies but the 260 requirement at ROBIN can be fairly critical to miss northbound overflight traffic. If you plan to be clever by leveling off higher just because the next guy didn't reiterate the requirement, I suggest you keep a sharp lookout to the right.