[RSS Feed/News] Slow query - ideas for an optimization?

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What do I want to achieve with the query?

I would like to count the reactions that a user has received. And only in a certain forum - in which - this is decided by the PostId respectively the ThreadId.

Unfortunately, the query needs about 5 seconds for each query. This is a mammoth task with the mass of posts approx. 9 million, topics approx. 500k and users approx. 200k.

Is there a way to collect the data faster here? do I have a thinking error in the query?


Code:

Code:
SELECT COUNT(*)
FROM...

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