Out of the blue, my vim startup time jumped to about 5 s, and I traced
the cause to yankring. Eventually I found that I had a large yankring
history file; however, yankring limits its yanks to 1 MB and the
history file was only 1 MB in size. My vim reads a 1 MB file in tens
of ms, so I investigated why yankring slowed so much.
Yankring writes each yanked item as one line, and if there are
multiple lines within an item they are separated with ^b, hex 02,
characters. So my yankring history file had a very long line, 1 MB
long, and when the plugin read the file with readfile(), it took a lot
longer than 10 ms, as revealed by
:let t = reltime()|let f = readfile('yankring_history_v2.txt')|echo
reltime(t)
it shows [2, 681477] which I take to mean 2.68 s.
Why is readfile() so slow when the file has a long, MB, line? (The
binary flag does not affect the speed.)
Regards, John
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