bug#57669: 29.0.50; C-n, C-p off under long lines

[Gregory Heytings]

> > And what's your conclusion now?
>
> The same?  I'll repeat:
>
> And to be clear, you're going from "ineffable" performance to just 
> "underwhelming."  As of cb036a7 you still need find-file-literally for 
> some semblance of respectability.

A rather strange conclusion.  Open a 1 MB file with short lines (under 80 
chars) and use your benchmark on such a file.  You'll see that scrolling 
through the whole buffer, one line at a time, takes quite some time, too. 
Here it takes about 20 seconds, and your benchmark (with find-file and 10 
lines that are each 100K characters) takes 120 seconds.  That's much 
better than "just underwhelming", isn't it?

Not to mention that such a benchmark is itself not representative of an 
actual use of an editor.