Dear,
I just bought and installed Bitdefender Internet Security 2013 on my Dell, and instantly it turned the computer slow.
My boot time was always about 15-18s, now it is 55+.
I'm not a newbie and the system was with a clean instalation, only Windows, Office, iTunes and Bitdefender, with no garbage on startup for instance.
On startup aplications the status for Bitdefender resident program is HIGH, all others is low or medium.
Just for example, my laptop runs Adobe Lightroom 5 (instaled only yesterday) smoothly, as well many other programs, as Chrome with dozens tabs opened.
Hope you can help fast to solve this situation, or I almost (for now) prefer the risk and come back to Windows Defender.
Regards.
Dell, i3 2100Mhz, 8Gb RAM DUAL-CHANNEL, W8 Pro 64b