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An old desktop of mine has some dedicated video hardware (over the air HDTV tuner etc.) that never had drivers and software updated for later versions of Windows so after using it with Vista, Windows 7, and Windows 8, I finally pushed it back to Windows xp since there are other computers in the house that I can run newer software on.
I'd never had problems with Silverlight on Windows xp in the past (aside from a horrendously long hang on Channel 9's video player when entering fullscreen for the first time and trying to check the checkbox that allows it to stay in fullscreen on a second monitor while I click and type in other windows on the other monitor[s]) and I don't recall this being the case when I first put xp back on the box about a year ago but for months now any page with Silverlight on it absolutely grinds the browser and sometimes the entire computer to a grinding halt while it soaks up all of the available CPU cycles.
Firefox is pretty good about telling me that the plugin isn't responding + clicking their prompt to shut down the plugin actually succeeds (after a two to three minute wait).
Chrome is completely awful as it will throw a new dialogue box at you about once per three minutes asking if I want to stop the plugin, only it never ever actually succeeds in doing so.
The only solution to this is to open Task Manager, isolate the Chrome process which is using the most CPU + kill it, hoping that I don't accidentally nuke any tabs with unfinished typing in them.
I'm aware that Windows xp is very much outdated software + is due to stop receiving security patches via Windows Update very soon.
I just know that there are a substantial number of boxes still running Windows xp.
I don't know if all of them have my problem but I think that it's worth someone investigating + possibly some sort of patch to Silverlight if you're going to continue to rely on SL for original synths.