Have to agree with DUDU, I've lately been doing a lot of animations that include hair and bullet cloth, and I always find it's best to do the simulation on the character in a scene by himself, once the hair movement and cloth movement is 'baked in' I simply save my character as a group (including the hair and cloth) into the objects tab, then I build my larger scene for rendering and pull my character from the objects tab into the scene and render since the hair and cloth is all set and will already move the way I want it to.  This is especially useful if you've got multiple characters with hair movement in the same scene, do the sim for each one in their own separate scene (but with the same scene forces applied, so it's not like the wind is blowing in a different direction for each character) then pull them into the main detailed scene, ready to render.

 Restif, sounds like you're encountering some odd stuff there, I know from your renders that you have no trouble at all building great and realistic hairstyles, it's weird to hear that Carrara is not behaving as it should when it comes to animations.  I always use a low poly proxy, no matter what, makes for super fast and accurate simulations (nearly realtime calculations) and I've found good success rendering out fairly quickly.  I wonder what's causing hiccups for you..