I found a workaround for AMD Adrenaline users
Go to display in Adrenaline settings
Disable VPR (on by default settings)
(variable refresh rate technology)
Turning off VPR has solved my frame issue in single player and the 2v2 I just tested
- also -
I got a response about this from SouFire at DeJake | AoEZone - The international Age Of Empires community
“RDNA cards work at very low frequencies if the game isn’t capable of stressing the gpu enough, aoe2 and most dx9 games run poorly on those cards with not a single fix from amd, the work around consist in disabling ULPS using msi afterburning and setting a manual frequency curve on amd’s software so the frequency starts above 1500 mhz, also in game you need to unlock the frame rate to try to stress more the gpu, but it only works in 1x1 and 2x2, on tgs the cpu bottlenecks it badly running low at 45fps so the stutter goes back due low stress on the gpu, you can try those 3 options to see if things get better. Sadly for aoe2 nvidia is just a better option.”