[Q] Help With Kernels

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http://forum.xda-developers.com – i usually like to hear music While Chattng on whatsapp or surfing net via Wi-fi...while Doing this my SGY becomes Slow and i dont like it...i understand that installng a custom Kernel will help me (correct if i am wrong) and presently on Hells Fusion #40 please anyone Help me ...that what should I do to have a fast multitasking on my SGY Currently on JBV3~~Hells_Fusion #40 (HowTos)