too much CJK spans cause chrome lag

[cailiang9]

When I edit a tex file using ace editor and syntex highlighter,
I always find the response of the editor is a little lag.
The tex file is in chinese and about 56kByte in size.

When I inspect elements in chrome, I found that there are too many elements.
e.g. 中华人民共和国 is <span ...>中<span ...>华...<span ...>国

I noticed that english words are in a single span.
So can CJK words also be merged as 中华人民共和国?
I think this will reduce the lag and improve the user experiences.

Considering the wrap line function, spaces, punctuation and symbols can be used to separate too long spans.

My laptop cpu is x61 T9300, already a mid-high cpu. If it is lag, other laptop will be more severe.

[nightwing]

Spans are needed to force cjk characters to be 2x normal character width.
see #460

[github-actions]

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