Admittedly, this question is too advanced for me but I'd still like to hear 
an answer even if only "Nope, impossible to change" or "Possible"

I suspect one of the biggest culprits for slowness is *nested lists with 
complex filters*. I.e pretty much the very point with TW. For an example, I 
think we even had to snip the native *Recent* list to prevent this but lags 
can easily get a lot more severe.

Naturally there is a lag when such a tiddler is opened/activated but the 
freeze also happens when such a tiddler is already open and you change 
someting *something else* on the page like create a new tiddler, even an 
empty one. Is this perhaps because such filters typically evaluate *all* 
tiddlers to see if they fulfill the filter criteria, including that new 
empty one? It's as if one has to redo the whole house every time a kitchen 
chair is moved.

So I ask; must necessarily the *whole* page be re-calculated even when one 
is not necessarily dealing with the complex tiddler in question? 
Specifically, could such complex tiddler(s) be isolated from the 
re-calculation of the page? Maybe a tiddler-local flag ("do not refresh 
this tiddler")?

Maybe the node version does things differently?

Thank you

<:-)

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