I have been (and will continue to be) a longtime user of ESET Smart Security for my Windows computers. I recently purchased a MacBook Pro, loaded Parallels onto the Mac OS, and began running ESET Smart Security on my virtual hard drive. So far, Smart Security is running very well, just as it has on all of my other computers. I thought that I'd get security software for my Mac OS as well and so I purchased Cybersecurity for Mac. Wow, was that ever a disappointment! My computer ran like molasses. It took about 5 minutes just to open a web browser (either Firefox or Safari), while I just watched the color wheel spin and spin. Likewise with iTunes. Opening the Finder or applications folder was equally (and painfully) slow. When I disabled ESET, my computer ran fine, but as soon as I enabled ESET again, my computer again started dragging. My MacBook is unusable when running on Cybersecurity for Mac and so I've given up and gone with Sophos (which doesn't at all slow my Mac OS down). I think that ESET needs to take a second look at Cybersecurity for Mac and work out the bugs before releasing it. I feel like I've wasted $40.