sounds like malware to me. i'm looking at this page without any ad blocker and I've got 6 small ads, one on the top and a few little ones down the right side that aren't intrusive (no video or obnoxious audio).
Also, although not always many times the ads are based on your browsing history :-) I don't have any problems with leaving a page open for a long time and the website doesn't continue consuming RAM if I leave it open. You either have malware or a very very old computer most likely
"Give a man a match, and he'll be warm for a minute, but set him on fire, and he'll be warm for the rest of his life."