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I would add generating large financial reports, enterprise billing etc. There is a huge business effect between for example 2 hours needed to calculate monthly invoices and 24 hours.

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Is any of that actually bottlenecked by arithmetic rather than pointer chasing?

Probably more likely inefficient data access patterns, such as N+1 queries, inefficient algorithms, lack of parallelism

no, 2 hours of addition on my cellphone at 2 gigahertz, 4 cores, and conservatively 3 additions per core per cycle would be 170 trillion additions

nobody needs 170 trillion additions for their nightly invoices

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