How do I speed up third party code lines?

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C#3.5

I have used Aforge . net API in my project. I am extracting frames from videos previously every thing was working fine but from morning API depended code lines I have used in my project have slowed
down the working....

Video files frame rate is 23fps, I have used VideoFileReader to extract the frames from video.
this specific line takes 70, 80 miliseconds

reader.readvideoFrame();

where as previously it's response time was not more than 15-20 milliseconds. other functions and code lines written by me are completely fine.

Please tell me if there is any way to speed up such things.