How to use save ply

Fixed in version 2.2.3.

I use version 2.2.3. In the example, its FPS is only a few frames. Please tell me why.
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Did you plug the sensor into USB 3 port? Also, just after opening there might be low fps, ignore these warning messages

If I get FPS, I want to confirm whether FPS is really so low. It is a USB3.0 port.
I did find that FPS was really low during the test.