What is your max temp? and what are the voltages in cpuz? Can you explain what the lacking in performance is, like stuttering for example, overall being slow in games or programs? What graphics card do you have.
Slow boot would me dependent on your hard drive, and overclocking you cpu wont change that. Getting an ssd would help your boot times and applications load faster, or going raid 0. Also I would need to know your temps and voltages during load. People that are usually pushing 1.5v on their cpus are in the 5ghz range, so your voltage looks high when looking at your old 4.3 overclock.