Is there any fix to ....,,,whenever I hit that explosion barrels with bullets it explodes with a lag .........any help will be appreciated

If it's 10-15 frames and it goes away after a few seconds then its normal. New to pc gaming?

Ya u got it right ......I am new to pc game and crysis3 is my second pc game ........so this lag is normal ...?...it also happens in multiplayer

Yeah, explosions(specially when you see it onscreen) eats a few fps during its duration. How long does this 'lag'(fps drop) last? Explosions and particle effects tend to lower fps quite a bit

It's last for few sec...then back to normal ....it occurs when I am close to explosion ......and also during grenade explosion ....any way to fix it or reduce it