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How am I only just seeing this. I use to run a script rather than pre built batch process.

But as Tom has probably said ( skimmed read it and saw he said lightroom which is what I now use. resize 1 image in the folder and then apply it to the rest of the folder via copy and export the jpeg. It will be a lot faster then opening up ACR and will less likely crash.

Doing this kind of edit will literally max out your ram and CPU which will freeze up your computer so if I was you I would do it in batches of 50 or so depending on  the spec of your hardware.