Increase FPS in the game (Warface)

Hello, recently I faced with the fact that our beloved game on my PC very low FPS(20-30),the Internet has not found effective ways how to fix it.But then I decided in the settings to change the resolution from Full HD to HD and now have less FPS drops below 60,but mostly 70-80.To play is much nicer. I advise everyone to do the same,the result will be 100% satisfied.