An SSD and extra 2GB would light a rocket under most systems, Windows or Linux.
True to an extent but I've run Windows 7, 8.1 and now 10 on the same machine and sluggish isn't in it. Linux runs way faster to the point a browser is opened and page loaded in under a second but Windows takes closer to 5. Opening explorer generates a 'loading please wait' message for a few seconds after opening on Win 10 but in Linux I'm done with my file operation before Explorer would have even rendered.
. The machine I have with the slowest I/O file (explorer) access, is not the one with the lowest spec of ram, cpu. But slow because it has a rubbish hard drive in it. Newer versions of Windows hit the disk very hard unless you turn off certain features. W8 hammers the disk regardless of what you do. As do many browsers. A SSD is becoming a necessity these days, regardless of machine.