Advice on the right loader/ progress bar during page processing

I needed your help for deciding what kind of loader/progress bar to use for a three-part loading process: uploading files, converting files, preparing new files.
The overall loading time takes 45-75s.
A ‘Infinity loader’ across all three parts
B A single ‘Percent loader’ with weighted averages for each part(for e.g. 10% for uploading, 60% for converting, 30% for preparing)


The best practice according to NNG is:

  • less than 10 seconds: use a looped animation
  • 10 seconds or more: use a % loader

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