Illustrator not using CPU's Turbo Boost

Hello! I've found that, given a heavy task, Illustrator refuses to use the turbo boost speed allowed by my new Intel i7-9750H.

I work in prepress and part of our workflow is saving Illustrator files with large bitmaps placed into them as PDFs. On my ten-year-old MacPro this takes about forty seconds. On my seven-year-old PC laptop this takes almost two minutes. On the brand new laptop I just purchased it's over two minutes. The laptops' hardware is all much newer and faster than the MacPro except for their processor configuration.

Watching the computers' resource monitors, the PDF conversion seems to mostly use the processor. RAM and GPU show very little activity during the save. The MacPro has two 4-core 2.9 GHz Intel Xeon processors. Activity Monitor on the old version of osX we use at work doesn't show much detail about how the work is being distributed. Both laptops seem to max out at their basic frequency, 2.3 GHz for the older and 2.6 GHz on the new one, even though other programs (even internet browsers) easily slip into turbo mode and take the processors up to 3.1 GHz and 4.5 GHz respectively. Illustrator draws a stubborn line across the bottom sixth of Task Manager's CPU-use graph.

How do I get Illustrator to use the full capacity of the processor?

Thanks!