No one is currently using mantle atm for BF4.
No one is currently using mantle atm for BF4.
I tried it for some time until it created an issue, forcing me to check the settings file to switch to DX 11
I run it on my R9 280X. I see around 40 frames per second (min) using ultra without AA, and possibly a higher resolution scaling.
You're experiencing occasional freezes and instability, especially after updates. DirectX performance seems to decline while the game's graphics improve.