There was at least one IBM machine that had a similar "feature". It could run in slow-mode or fast-mode. Always-on fast-mode cost more per month than slow-mod

There was at least one IBM machine that had a similar "feature". It could run in slow-mode or fast-mode. Always-on fast-mode cost more per month than slow-mode. (Yes, these machines were leased, not sold.) However, you could get "fast-mode" on an as-needed/hourly-basis, for a "small" fee of course.