On Thursday, October 24, 2019 at 11:22:24 AM UTC+2, A Gloom wrote:
>
> It's the long lists that may make problems. ... HTML performance problems 
>> start with lists >1000 (especially on mobile), if they have to be redrawn. 
>>
>>>
>>> So a limit[250] filter may be an option. BUT there should be a button 
>>> below the list with eg: "Show Full List", which opens a full list in the 
>>> story river. 
>>>
>>
> Yep, it was involving over 1000 toc entries-- I didn't know of the hrml 
> issue-- would multiple toc macros in a sidebar tab (another trick I use, to 
> break a larger toc list into "sections") also fall under this (all section 
> list entries summed as one) or be considered individually?
>

Hi, 

The TOC macros use the reveal-widget 
<https://tiddlywiki.com/prerelease/#RevealWidget>. This widget has a 
parameter named: retain. This parameter defines, if "*invisible*" elements 
are kept and updated in the DOM. The *default value is no*. 

So elements in a hidden branch in a TOC won't cause any performance issues. 
Only visible elements do. 

-m

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