The recently on Steam released Hotfix 1.0.1 for X-COM 2 should fix some bugs and improve overall performance. Official Announcement:

Hotfix Released (Mac/Linux) 26. FEBRUAR - [FERAL] EDWIN We’re happy to report that the 1.0.1 hot fix update for XCOM 2 (Mac/Linux) is now available. This update will automatically install when starting the Steam client. If it doesn’t automatically, restart Steam. This update includes all the fixes contained in the Windows hotfix released last week. Details of all the fixes are listed below. Mac/Linux Fixes Player is unable to progress to scan in the Geoscape after completing the Resistance Communications research via Tutorial – This will fix previously affected saves. Unable to load saves with a Chryssalid Cocoon – This will fix the issue, and for previously affected saves. Using the preview voice button for a modded voice pack will no longer crash the game when in the armoury. Improvements to frame rate and in level hitching. Fixed issues with Mods not enabling on some machines Improved “Refresh” button behaviour in modding panel Fixed issue with Shen’s leg flickering Fixed issue when switching from Japanese to other languages. Various minor improvements. Linux Specific Fixes Fixed rare corruption caused by LC_ALL flag in users .bashrc file Fixed discoloured pink/blue smoke on some Nvidia hardware Updated warnings for users using unsupported Nvidia drivers Fixed Red Lights above units in level on some Nvidia hardware Fixed conflict between depth of field and bloom on some Nvidia hardware Fixed crash on launch when VPN or other virtual networks are enabled. Fixed Fountains out of game area not correctly fogged We will continue our patch support over the coming months with additional fixes and performance updates. If you have any issues or questions with the Mac/Linux hotfix please contact our support team via email xcom2support@feralinteractive.com or go to our website http://support.feralinteractive.com

Source: Steam