As Microsoft issues patches and your antivirus adds more things to look for the boot time will slowly increase.
At under 30 seconds I would not fix this but understand it's normal.
Hi I have got a Packard Bell computer with Windows 8. I got the computer in July.
It used to take about 16 seconds or so to go pass the message and onto area where I could enter the password and log in.
It has been getting slower for the last few days and now it takes up to 20 plus seconds.
I have defragged, removed temp files and I have done a virus check.