Incredibly long render times on RTX 3090

Hello!
I’m rendering a 20 secs animation (30FPS) of a fountain with alot of fluid sim.
I have 104gb of baked fluid, in viewport render view, performace is pretty normal and it can sample 1024 samples in under a minute. Changing frames takes few seconds.

However, when doing a normal render, at 1080p, 300 samples, 1 frame takes around 6 minutes of loading and 36 minutes of rendering.

Is this something that is normal to happen, or is something going wrong?

RTX 3090
i9-12900k
36 gigs of DDR5 memory

Thanks.

SOLVED by turning off motion blur.

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