Infernal (2007 PC) Speedrun -  

51:03 RTA
Aside from mission 3, this run went really well.
Upd: some new skips • Just new speedrun stra...
Upd2: you can save another 1 minute from 44:39 to 45:50 by flying backwards (this should be easy to figure) after getting back from teleportation state right to the end battle trigger. If it's hard to get without dying then you can empty your pistol and press right mouse button to hover in the air for a second.