How have good FPS in 8MP on IMX519?

When I set 8MP for viewfinder, the FPS will be down to 10 FPS.
It is the same as 16MP setting on CM4.
Is it normal ? Is is possible for 20 FPS on 8MP ?

This is normal, currently 8MP is around 10Fps

Do you suggest any products for 20~30 FPS on 8 MP ?

If you are on a Raspberry Pi, we cannot support 4K30fps on the Raspberry Pi because the bandwidth of the Raspberry Pi itself is relatively low and cannot support too high speed. If you are on Jetson, imx219 and imx477 are reachable.

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