bug#56682: Fix the long lines font locking related slowdowns

[Gregory Heytings]

> > > However, if much larger JSON files exist, we should first see what 
> > > that proposal produces with such larger files.
> >
> > As I just said to Dmitry: the same multi-second delays we saw in 
> > smaller JSON files.  And those who have a slower CPU will see these 
> > multi-second delays with smaller files.
>
> Where can I download such files?

As Stefan said, JSON files are machine generated, so you can just 
concatenate the dictionary.json file as many times as you want to obtain a 
larger file.