Well a SSD will probably help. I think the slowness in Vista was it's constant disk access. 4GB of ram is probably bare minimum for it to work not bad, but most of the machines I've seen had less than that. OP said older machine so I was thinking something along the lines of like a single or dual core with 1GB of ram and slow 5400rpm hard drive. I recently used it on similar machine (I don't recall the actual specs, but it was a machine that came with Vista and back in the day they were way under powered). I found that everything I did was just so slow. I found it was a game of constantly having to wait. Even opening the start menu took a long time. It's seconds instead of instant, but that feels very slow when your mind is 20 steps ahead of what the computer is at. It's not to say that it was probably faster when it was a completely fresh install, but a typical machine that's been "broken in" will be slow compared to any other OS. You can't just base speed on when it's a clean install, of course it's going to be decently fast. Install A/V, drivers, misc stuff that may need to run in background, and then try to perform an actual task on the computer, perhaps even try to multi task such as browsing the internet while rendering a video and it wont be so quick anymore.