Sorry, I'm probably not going to use the correct terms but I hope the questions still makes sense. I'm looking for alternatives and best practices for speeding up a video.

(Also sorry if this a duplicate posting. I started to compose this and my login must have timed out. Luckily I had made a copy of the text.)

I need to speed up a video by 16 times. To do this I import the original video (30fps), hold down Control and drag the end of the video, which increases the playback rate by up to 4x. I render the video at 60 fps, high bitrate, import it, and repeat. It may be wrong to do, but I increase the fps as I render the spedup videos in an attempt to preserve some quality in the intermediate videos.

This method takes time but works OK. The problem I have is there is so much blurring that occurs. This would be great in some cases I'm sure, but in my case, the motion is back-n-forth and at such a speed it's sickening. 

Is there a way to reduce the blurring? I see a button marked "bypass blurring." Is the following alternative possible, to render a video of the original video, but keeping every 16th frame? That would speed everything up, and while would look choppy, it may actually work better for my video.

Thank you