Halo 2: Anniversary's campaign doesn't currently run at 60fps, but 343 Industries promises that the full game will hit its 60fps target come its release in November.

The single-player demo, which VideoGamer.com went hands-on with earlier this month, appeared to run closer to 30fps than the targeted 60fps, despite the multiplayer build appearing to achieve a fluid 60fps frame rate.

"We will be running at 60fps when we ship," executive producer Dan Ayoub told us when quizzed over the campaign's current frame rate. "What we're showing is obviously still work in progress and we're still doing a lot of optimisation. Pretty much every game in the Collection will run at 60fps."

Part of the reason for the current performance issues may be linked to the engine powering Anniversary's campaign, which allows players to seamlessly switch between the original untouched graphics and remastered visuals at the touch of a button.

"[Halo 2: Anniversary's] engine is an evolution of the first Anniversary engine, which is basically two engines running at the same time and that's where we get the switch from," Ayoub added. "Essentially what we did was we took the original Halo Anniversary engine, modified that and upgraded it, and effectively what you've got there is both engines running in parallel and you're really just dictating which engine you see with that switch.... Halo 5 is using a brand new engine that's been created specifically for Halo 5."

It wasn't immediately clear from the demo how recent the playable single-player build may have been.

Halo: The Master Chief Collection launches on Xbox One on November 14.