89
Alright, you know what? I'll be switching.
(kbin.social)
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
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I strongly recommend XFCE if you can't upgrade. It's the snappiest of the easy DEs, and on a 10yo laptop, I suspect you'll notice. LXQT is half a tier more difficult, depending on how much you want to tweak the work flow.
If for some reason XFCE is still too heavy and slow, you can go lighter than LXQT without giving yourself a headache, but the only true beginner openbox distro I know of is Mabox, and you seem to prefer point release distros.
Edit: You know what though? Try KDE first; if it's fast enough for you, great!