Recently found myself using irssi on a setup that's slightly unusual, so I'm recording the information I found useful for posterity. To switch windows, use Alt + number keys for windows 1-10, or Alt + top row (qwertyuiop) for windows 11-20. Alt+Left / Ctrl+p and Alt+Right / Ctrl+n switches to the previous or next window respectively. It loops around from first to last or vice versa. The script revolve is useful, since it compresses consecutive joins/leaves onto a single line. Useful for channels where there's not a lot of activity.