Does the transform() function decrease the frame rate of real-time video?

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DirectX

media

C++11

camera

I have a question related to DirectShow transform filter.

I use USB2.0 camera to get the real-time video at 30fps (1920x1080) and I want to process the video image by inserting a transform filter. But after the insertion, the frame rate is decreased. For example, the processing time is about 15ms, then the frame rate will drop to 1000/(33.3+15)=20.8fps. As if getting video data and processing video data are executed synchronously.

How can I get the asynchronous execution and get a higher frame rate?

What I have tried:

if i need to override the receive()function?and does it make difference? thanks for your help!