New MacBook, new iMac and a new version of Lightroom.
You're pretty lucky
I've been a Microsoft user since the 1970's, programing in BASIC, BASIC-A, GW-BASIC, Visual BASIC,. Microsoft Assembly Language, the MS DOS Operating system and have been a Beta tester for every version of Windows.
I have high end systems and keep them tuned quite well. Microsoft, with their attempt to compete with Apple's updating process, has scrambled my computers for the last time. The last 2 updates to Windows 10 Pro was more than I want to endure again.
I probably should have switched to Mac years ago.
Can I ask what spec Macbook you have, and how does it run the new Lightroom CC?