Need to make some changes on my Apple memory

I used to think that the video card was the problem. My screen freezes, my computer becomes so slow, and sometimes it won’t let me use my peripherals. When I asked a techie friend to do the diagnosis on my computer, she told me that it has something to do with my Mac memory, that I need to upgrade my memory to be able to speed things up. I tried getting some information online as to what is an Apple memory upgrade and how to go about upgrading it. I visited the website my friend told me, where she got her own Dell memory upgrade from, MemoryUpgrade.pro. MemoryUpgrade.pro has all the information one clueless person would ever need about memory and upgrading. They even have videos that explain the procedure to make sure everybody gets it right. What I like most about this site is that it offers the most affordable quality Apple memory upgrade.