I don't think I've used the previously viewed sites thumbnails once in all the time I've been using Chrome, and I downloaded it literally the first day it was available, back in September 2008, and have used it as my primary browser off and on many times over the years.
I've noticed that in at least the past year and a half it's become a real memory pig. I fired up my ancient netbook a few weeks ago, which back around when I got it I ended up putting Chrome on because Firefox's UI was dreadfully slow. Now it was Chrome that was so slow it was unusable. The netbook only has 1 GB of RAM (if I upgraded it to 2 GB, I'd lose the ability to overclock the dinky Atom Z-series processor, which on balance would be too much of a loss), and Chrome was already pushing memory use into the 1.2 - 1.5 GB range with just one or two tabs open, so it was paging like crazy. It would sometimes take several minutes to load a page. Putting Firefox on instead all of a sudden brought the netbook back to its usual, hair-pullingly slow but basically usable performance level.
Not to mention I've been experiencing this bizarre issue:
I would so love to put a Linux distro on this thing, but alas it has the dreaded GMA500 graphics, which have never been well supported by *nix variants, so it will spend its retirement with XP and probably never get used for much, if at all, once support ends.