Important Note: We suggest reverting these changes for any patches that come, as it could affect them. No more slide-show explosions, or missed action-shots. I'd go as far as to use the phrase 'buttery smooth'. There is still a little stutter evident in the loading transitions while in the dropship, but in-game performance is definitely a huge improvement. Having tried these changes myself, I can report that performance leapt from 'frustrating and shoddy' to 'entirely playable'. Original credit to this tester for Unreal Engine 3 here from 2013, regarding the original XCOM game. In fact, besides Poolsize, you can tweak quite a few settings in your game's ini file, but as usual, it appears that PoolSize is the primary factor in smoothing out the performance. In fact, the default PoolSize is set at just 10Mb, and I suspect that Feral have to leave it that way to ensure maximum compatibility. In particular, many titles using UE3 suffer from an extremely low default memory allocation. However, this has brought some hangovers from that earlier version with it, hangovers that Feral left in place during the porting. Porting all their customisations to the newer engine would have been daunting, so they decided to stick with that customised engine for XCOM2.

It seems that when they brought XCOM: Enemy Unknown to the masses, they'd hacked that version 3 engine so much, it was practically an entirely new fork. When Firaxis chose to use Unreal Engine to power their latest title, XCOM 2, they chose to stay on the older version 3 of the engine instead of the latest, and fully Linux-compatible, version 4.

Xcom 2 patch notes may