Hi Mat, If we only look at the the <$list line, they are fundamentally different.
The *first *one assigns a macro-call to the filter variable The *second *one assigns a string value to the filter variable. The *first list* needs to run 2 filters. 1 in the set widget 1 in the list widget The *second list *needs to run only 1 filter .. which shuld be faster as calling a macro and run 2 filters If you open the https://tiddlywiki.com/prerelease/ and paste this code: \whitespace trim <$set name=myfilter filter="[tag[foo]]"> <$list filter=<<myfilter>> /> <$list filter="""[<myfilter>]"""/> </$set> Activate the preview: *Parse Tree* You can see the result is very simlar. See the macro-call Activate the preview: *Widget Tree* The result is different. -------------------- Open close the preview several times .... F12 ... open dev consule select the "Console" tab click the "bin" button to clear the output type: $tw.perf.log() which will open the filter log. .... The filter a should be around line 40 .... filter [<myfilter>] is around line 80 This suggests, the second one is faster. ... I'm not sure if the new filter optimizer is responsible for this. have fun! mario -- You received this message because you are subscribed to the Google Groups "TiddlyWiki" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/tiddlywiki. To view this discussion on the web visit https://groups.google.com/d/msgid/tiddlywiki/7c6fff1b-d5f8-45f2-a760-c30452555f3d%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.

