The known issues list says "Shockwave animations are sometimes slower than on Windows. This is mostly an issue on slower machines."
On a P4-2.2GHz, running Crossover Plugin 2.1 and Shockwave 8.5, the "hotel view" front pages on www.habbohotel.com, www.habbohotel.nl etc are more than a little slow - about one tenth of the normal speed. This would be fine, except that it also brings the whole machine to a crawl, with X11 using over half of the CPU and all window updates showing huge lag.