What's the best computer for Premier Pro?

I just downloaded Pr last week on my Mac laptop (specs below), but playback is just so crazy slow, even after figuring out how to use proxies. Proxies worked once, everything was smooth... but when I returned to the project the next day, it was lagging again. I almost want a refund.

So I just want to hear your opinions on what's the best computer to use, OR what you're using.

Desktop vs Laptop / PC vc Mac

(My laptop specs)

MacOS Catalina 10.15.1

Processor 2.2 GHz Quad-Core Intel Core i7

Memory 16 GB 1600 MHz DDR3

Graphics Intel Iris Pro 1536 MB

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