> select ?le ?la where {
>      ?le adm:logDate ?sdate .
>      FILTER(?sdate > "2021-08-20T00:00:00"^^xsd:dateTime)
>      BIND(?le AS ?la)
> }

In that trivial case yes, the longer query doesn't allow that:

construct {
  ?eadm tmp:lastSync ?d .
  ?eadm tmp:dateCreated ?sdate  .
 }
WHERE
  {
    {
        ?le adm:logDate ?sdate .
        FILTER(?sdate > "2020-08-20T00:00:00"^^xsd:dateTime)
        ?le a adm:Synced .
        ?va adm:logEntry ?le ;
            adm:adminAbout ?v .
        ?v bdo:volumeOf ?iinstance .
        ?eadm adm:adminAbout ?iinstance .
    } union {
        ?le adm:logDate ?sdate .
        FILTER(?sdate > "2020-08-20T00:00:00"^^xsd:dateTime)
        ?le a adm:InitialDataCreation .
        ?eadm adm:logEntry ?le ;
            adm:adminAbout ?e .
        ?e a ?type .
        FILTER (?type != bdo:ImageGroup)
    }
  }

and takes 3.5s.

Best,
-- 
Elie

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