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WinSCP slow speed SCP/SFTP - How I fixed it

Hi folks,

old servers I knew were capped at 10Mb/s, so when WinSCP reported 1MB/s I was actually happy with it, so I stopped paying attention to it.

Recently I noticed that even from 1Gb/s and 100Mb/s servers, WinSCP was still downloading at 1MB/s so I got curious and then little frustrated when I noticed culprits were always the same servers, while others ranged from +4.5MB/s.

I changed most relevant settings but the one that actually worked was to disable Connection -> Optimize connection buffer size.