(...modules of unusual size.)
Enabling full syntax highlighting for very long Lua modules can produce DOMs
that have hundreds of thousands of elements and cause browsers to lock up.
I took a count of spans by class (which amounts to a count of tokens by type)
of https://en.wiktionary.org/wiki/Module:languages and came up with:
sy0: 62545 (symbols)
br0: 61952 (brackets)
st0: 39291 (strings)
kw3: 7746 (keywords)
kw1: 3
kw2: 2
co2: 2
co1: 2
nu0: 1
------ ------
Total: 171544
GeSHi allows you to disable highlighting for a particular token type (see
<http://qbnz.com/highlighter/geshi-doc.html#disabling-lexics>) which like a
good way of handling this issue.
Disabling symbols (set_symbols_highlighting(false)) removes both sy0 and br0
elements from the DOM (about 124k elements in the case of Module:languages),
with about 47k elements remaining on the page. This is enough to make Chromium
responsive on my laptop (2.3ghz i5, 8 GB RAM), but it's still noticeably
sluggish. Adding 'set_string_highlighting(false);' removes another 40k elements
from the rendered output, and the resulting DOM is quite zippy at 8k elements.
Proposed solution: disable symbols highlighting when >100 kB; disable strings
highlighting too when >200 kB.
Change-Id: I90c645f9d03bbdc135058a3717a463dec40aa77d
