an i5 CPU, a humble CPU has been around for quite a while now getting the job done, though is not that fast, even at 4.4 GHz. i7's are over 3 times faster. Skyrim makes reasonable use of CPU so it would be advantageous for any changes here. That said, Skyrim core is not as CPU bound as say Microsoft FSX or DCS BLACKSHARK where adjustments pay off in dividends of several orders. ENB - which performance option are you using? Full SSAO (slow) uses Full SSAO and SSIL, both CPU and GPU hungry features. Consider, Lite SSAO or No SSAO - do you see performance benefit here? For more information refer to the ENB doco.