Frame Speed Slows to a Crawl

I am doing a simple pedestrian video in Twinmotion. I have maybe 25 frames or so, and everything is fine until the final two frames. At that point the two frames crawl almost to a standstill. It literally takes about two minutes for them to complete, which makes them unusable. I exported, thinking maybe the export would be ok, but it too slowed down at the same point.

I can see where to set the overall video time, but is there a way to edit the frame speed of a particular frame…in this case, speed them up? Not really sure what’s going on.

Thanks.

Check your render settings at the end of the video timeline. The length of video is set above the timeline. Copy the ambience from the first frame and paste to all others.
timeline