I'm always on the lookout for programs that run well on my old hardware. My latest good find is the K-Meleon web browser, a Mozilla off-shoot. Here's a snippet from the homepage:
K-Meleon is an extremely fast, customizable, lightweight web browser based on the Gecko layout engine developed by Mozilla which is also used by Firefox. K-Meleon is Free, Open Source software released under the GNU General Public License and is designed specifically for Microsoft Windows (Win32) operating systems
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I have the browser running on my old Compaq laptop with a Pentium III and a gig of memory for Windows XP. It loads as quiickly as Opera, and it runs quite a bit faster than Firefox. The browser is fully compliant with modern standards, and the interface is familiar to anyone using any of the other currently popular browsers. K-Meleon delivers particularly impressive performance in running youtube videos, showing no degradation of the video or audio streams.
I recently refurbished a Dell Inspiron 6400 with the dual core processor and 2 gigs of RAM. It is fast enough to run the Chrome browser well, but is seemed worthwhile to try K-Meleon too. I don't see much difference between the two in this case.. With both the Dell and the old Compaq, I am running the currently next-to-last version (75.) with Win XP on the Compaq and Windows Vista on the Dell.