While Titanfall might be one of the Xbox One's most popular games this year, Respawn said the game wasn't originally in production for the console at all. In an interview with Eurogamer, lead engineer Richard Baker explained that Titanfall was initially in development for PC only, saying that "originally we weren't planning on an Xbox One version of the game." Baker added that Xbox One development made the PC version of the game that much better, as it "justified the effort in moving to [DirectX 11] and even 64-bit."
Those changes were necessary to adapt the Source engine so the game would run properly on Xbox One. This heavily involved making the engine "multi-threaded" so it "buffered commands as soon as they were issued." Among the other development decisions made by Respawn was the use of uncompressed audio in the PC version's 48 gigabyte download.