The truth is that ENB's are very performance intensive as far as visual upgrades go, they aren't essential in any way- they are meant for enthusiasts with the systems able to take advantage of it. What visual mods are you running? and what FPS are you achieving now?
What resolution and AA settings are you running Skyrim at? It would be more useful if you posted your system specs, without knowing what you have- it's hard to say if you can even run an ENB.
