Why did older movies (50s-60s?) so often include scenes that were sped up?

Just watched Rear Window (1954) with the kids. They loved it, but giggled at the scene at the very end where one character is in danger and others rush to help -- because (at least in the version I watched), the film in that 20-30 sections is sped up maybe 50%.

I've noticed this effect in other older movies during action scenes, and it's always extremely jarring to me. Why was this effect used, and why did they stop using it?

It does make me wonder what current film techniques will seem hilariously quaint 75 years from now ...

submitted by /u/icarussc3
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source https://www.reddit.com/r/movies/comments/1231t2a/why_did_older_movies_50s60s_so_often_include/

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