I fired up my former favorite laptop, a Gateway MX3210. It’s a Celeron M Dothan Single Core at 1.4Ghz and with 480 of RAM. I have antiX-17.4 running. I installed SlimJet to try it out. This computer is only a little better than my Compaq Deskpro EN P-III that I do a lot of my testing on. I usually use SeaMonkey on this machine.
SlimJet runs fine on this machine since The Celeron M Dothan supports SSE2. It uses a little more memory than SeaMonkey, about 259M when running with one tab open on this forum (SeaMonkey is about 207M). And after I installed NoScript it is about the same as SeaMonkey in response. But the extra 50M of RAM is significant on this machine since it is less than 512MB. I have found SeaMonkey to be the best at memory use and that is why I use it on these old machines with less than 1GB of RAM.
SlimJet is familiar since I use Chrome a lot in my business. I deleted Chromium and FirefoxESR from this machine and now have SlimJet and SeaMonkey instead.