This enb have 3 version , High , Medium , Low , if you have lag , Recommend use Low sett.
Don't Forget to visit : www.gtaforums.com/index.php?showtopic=488840

My spec :
Ram 2gb
Nvidia Geforce GT540M 2gb
Core i5 2430M 2.4 GHz - 3.0 GHz

Thanks for download & reading.