SDO_FILTER and SDO_RELATE combined in the same query

Is it possible to combine these two operations?
I have a query that ideally should use SDO_RELATE for polygon data (some 25 million records). However it takes too long to run.
For curiosity's sake I tried using SDO_FILTER and again this takes hours. Again for curiosity's sake I combined the two and records are returned in about 2 mins. Please see the query below (to simplify matters I have used point data).
SELECT
FROM
table t
WHERE
MDSYS.SDO_RELATE(
t.geometry,
MDSYS.SDO_GEOMETRY( 2001,
null,
MDSYS.SDO_POINT_TYPE( 501900, 308000, null ),
null,
null
'mask=anyinteract querytype=WINDOW'
) = 'TRUE'
AND MDSYS.SDO_FILTER(
t.geometry,
MDSYS.SDO_GEOMETRY( 2001,
null,
MDSYS.SDO_POINT_TYPE( 501900, 308000, null ),
null,
null
'mask=anyinteract querytype=WINDOW'
) = 'TRUE'
As I see it, in this case SDO_FILTER is doing the primary filtering part. SDO_RELATE is doing primary filtering again followed by secondary filtering the resulting data which is why it is quicker. The data does appear to be correct.
Now am I barking up the wrong tree? Whether I am or not, why is this combination faster than individual use? I would appreciate any thoughts on this please.
Cheers guys
James

something else is going on, although without seeing the real query it is hard to know.
SDO_RELATE is a supoerset of SDO_FILTER. With SDO_FILTER and index query is done, with SDO_RELATE an index query is done, then the relate is done on the geometries returned by the filter query.
What kind of index are you using?
What version of spatial are you using?
Can you post the query window?
Are your geometries valid?

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