

SublimeText seems to have it. I don’t personally use it but it’s a pretty competent editor and it’s not in the feature table from the Wikipedia page someone else shared.
Sublime 3 was limited to folding by indentation; I’m not sure if that’s true for Sublime 4 as well, but the Markdown plugin docs have a note on folding and mention you can fold by section and heading levels.
I’d expect performance under the 5600X3D, which at https://browser.geekbench.com/processor-benchmarks got a score of 2085. For reference:
Note that these results are aggregated from people with this hardware running Geekbench on their own machines and the rest of their hardware and config (including, for example, cooling, overclocking) isn’t controlled for, and as such is very likely to be different, which would impact results.