Terminal Velocity Portals no longer seem to work

[james]

See the following release note:

@james

Portals:

• Modified heuristics for opening Portal connections so that they will only be opened if actively looking at the Portal, with a slightly longer delay on the opening to prevent pointlessly opening connections in Portal hubs.
• The aim of this is to improve the engine’s performance in Portal dense areas. Previously the engine would preemptively start connecting to and downloading chunks from many of the Worlds that you had no intention of visiting. This changes focuses the engine of using bandwidth for the Portals you’re interested in exploring.