Mathematica: Use of UnitConvert (or even just multiplication or division by a unit Quantity) MASSIVELY slows the calculations down!

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ISSUE
LIMITATION
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INFORMATIVE
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As demonstrated by the quick tests shown in the image use of UnitConvert or even mere multiplication by a unit Quantity massively slows downs calculations by 1000s

This limitation is a dreadful shame given how useful the MMA Quantity system is.

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Related notes
[ISSUE, LIMITATION]{INFORMATIVE} Mathematica: Compile won't work with a Quantity with units
[ASSERTION, TIP] Mathematica: The awesome Quantity system for values with units is everything the SysMLv1.x Quantity/Unit system should have been (and hopefully SysMLv2 will be). But it comes at a high performance cost!
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