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BQ query speed in recent weeks?

Hello - so I've been using BQ to query a few-hundred-GB dataset for a few years now. Data is constantly inserted (and still seems to be with no issues), and with the exception of complex JOINs, queries run rapidly (like <30s, consistently).

I've been away for 2 weeks, and I come back to find even simple queries that would complete in 30s or less are running for 30minutes or more. Nothing has changed with the queries, data, tables etc.

Did I miss a fundamental change to how BQ works in the past few weeks, or is this perhaps a temporary issue that should pass?

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