Vi editor: What's the fastest way to delete multiple rows in a file?

If you mean you want to keep every 10th line and delete the rest:

%norm 9ddj

Explanation:

% whole file

norm execute the following commands in "normal mode"

9dd delete 9 lines

j move down one line (i.e. keep it)

note: this deletes the first row.

Adapted from http://www.rayninfo.co.uk/vimtips.html

Or using the global command:

Adapted from https://stackoverflow.com/questions/1946738/vim-how-to-delete-every-second-row

Or you could use awk:

%!awk 'NR \% 10 == 0 || NR == 1'

:2,$v/0$/d

deletes the lines that don't end in 0 starting from the second one.

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