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(Sorry for the late response, just saw this message)
Windows applications are the worst example imo. If their own start menu can use 100% of the cpu because they decided to use react native, you know that windows is not the correct example to take from. Windows is a mess, and has been for years.
Take any pre 2010 program running on 2010 hardware and compare the performance of that program to a react native one running on today's hardware. If that comparison doesn't work to prove the point just yet, take a program from before 2005 running on 2005 hardware and do the same comparison.
When I use the word native I mean those kind of applications.