How much is Discourse affected by a faster CPU?

The existing guidelines of 1GB RAM for “small” Discourse and 2GB ram for “medium” Discourse are quite reasonable and valid.

Swap is always recommended for Discourse. You can check free -m to determine how much swap is in use. In typical use you should see low swap use, like so:

              total        used        free      shared  buff/cache   available
Mem:           2001        1343         107         218         550         253
Swap:          1023         175         848

If you see high swap use – if used was 900 instead of 175 that indicates a problem, that the instance may need more physical RAM.

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