Oui Battlefield 4 est optimisé parfaitement, après Evolve l'est aussi. Moi souvent ce sont les particules qui me font baisser les FPS. Sinon, je reste à du 58/60 constant. J'ai une carte Nvidia et toi une AMD, donc ça ne vient pas des pilotes pour toi je pense. Fais une restauration du système, vérifie l'intégrité cache du jeu, sinon n'hésite pas à envoyer un billet à 2K pour tenter de régler ton souci.
Pour ne pas perdre ton temps avec eux, je peux te filer un mail qu'ils m'ont envoyé récemment quand j'avais un autre problème sur le jeu. Ils m'ont envoyé toute une série de solutions potentielles, tu peux essayer si tu veux
Ensure that you have Administrator privileges on the computer you are trying to run the game on.
Ensure that all non-essential USB devices are disconnected from the computer for the purposes of troubleshooting. This could include (but isn't limited to): game controllers, flight-sticks, etc
Update your video and sound drivers (refer to manufacturer’s website)
Disable Background Applications
It is strongly recommended to turn off all background applications when running graphically intensive programs. Many applications can cause errors such as GPFs, color scrambling, loss of sound effects or music, etc. Taking a minute to turn off these applications can save you the trouble of rebooting later. Background applications include such things as System Agent, Norton Utilities, Internet chat utilities, virus checkers and screen savers. Crash guard programs such as First Aid for Windows can also cause problems.
Click on the Windows icon in the lower left corner of the screen.
Click on Start Search
Type in msconfig and press the Enter key on your keyboard.
Click the Continue button if the message Windows needs your permission to continue
appears. If this message does not appear, please continue to step 5.
On the General Tab, choose Selective Startup.
Uncheck the option to Load startup items.
Click Apply, then Ok, and restart the system when prompted.
Reinstall Direct X Updates
It is possible that the version of Direct X running on your computer is encountering errors with the game you are trying to play. If this is the case, we advise reinstalling Direct X. The latest version of Direct X can be found here http://www.microsoft.com/download/en/details.aspx?id=35
Disable SLI/CrossFireX
Many games do not support either the SLI or CrossFireX features of Nvidia or ATI video cards. It is advised to disable SLI/CrossFireX if you are running two or more video cards in the same computer when encountering issues. Please refer to manufacturer’s website for more details on how to enable/disable this feature.
Lower Sound Acceleration
Press Windows + R to bring up the run box
Type control panel without quotes, press ENTER.
Goto Hardware and Sound > Sound
Pick your sound device that is set as default
click Properties.
Go to the Advanced tab
Set Default Format to 44.1khz 16bit.
Click Apply and then click OK to accept the new setting and close the dialog box.
Click OK to close the Display Properties dialog box.
Restart Windows.
Verifying the integrity of the game cache (only applicable if you have the Steam version of the game)
Right click on the game in the Steam library and select Properties
Navigate to the Local Files tab
Click Verify integrity of game cache