I didn't find the topic in here, but I remember that it was mentioned several times that there is an AMD graphic card issue since the November 2020 patch. I found this reddit topic, but sadly I dont habe an account there: https://www.reddit.com/r/aoe2/comments/si9big/amd_and_age_of_empires_2_definitive_we_found_why/
I also had the problem in november 2020 and was in contact with the support team. After some months I finally found out what was causing the lag. I will quote my E-Mail to the support team:
"Hello,
I found out what the problem was. In my graphics drivers there are 3 options for AMD FreeSync. The options 'on' and 'AMD optimized' completely destroy Age of Empires. After forcing FreeSync to be deactivated the lag problems were gone. The problem is that the standard option is 'AMD optimzed', so you have to deactivate it manually. I hope these information help you to fix the problem.
Best Regards"
Maybe this helps some of the people with lag problems with their AMD graphics card. If it works for you, you could maybe add it to the reddit discussion.
I also had the problem in november 2020 and was in contact with the support team. After some months I finally found out what was causing the lag. I will quote my E-Mail to the support team:
"Hello,
I found out what the problem was. In my graphics drivers there are 3 options for AMD FreeSync. The options 'on' and 'AMD optimized' completely destroy Age of Empires. After forcing FreeSync to be deactivated the lag problems were gone. The problem is that the standard option is 'AMD optimzed', so you have to deactivate it manually. I hope these information help you to fix the problem.
Best Regards"
Maybe this helps some of the people with lag problems with their AMD graphics card. If it works for you, you could maybe add it to the reddit discussion.