Hey there.
I think that everyone can just confirm performance is way too low on the Contact DLC. Personally testing the map itself does not degrade it. It's the horrible amount of scripts running on the background with the Contact Edition.
Based on: https://steamcommunity.com/app/107410/discussions/0/3158630999986600955/
multiple other people experience this heavy performance loss.
Please don't be a dickhead and keep calling people out for bad hardware setups and graphics settings. I can confirm that playing the Contact DLC is not statisfying and I seek to possibly refund.
Other examples of people having problems: https://steamcommunity.com/app/107410/discussions/1/3158630999989030568/
Another example: https://www.reddit.com/r/arma/comments/cib5ba/comment/ev5zw2i
And over again: https://www.reddit.com/r/arma/comments/cnixl8/poor_performance_since_contact_dlc/
I think we all can agree this is an major issue.