How to increase the frame rate when pitch of viewpoint is above -20?

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How to increase the frame rate when pitch of viewpoint is above -20?

Hi, experts!

I found that, in osgearth, frame rate is significantly affected by the pitch of view. When the pitching angle is near -90 degrees, the frame rate could be about 60. And when the pitch rises to -20, the frame rate would fall below 20.

when pitch is near -90 degrees, the frame rate is near 60

when pitch is above -20 degrees, the frame rate falls below 20

Why did this happen? And How to increase the frame rate when the pitching angle is above -20?