Sure, I can try to order the list from the most beneficial to the least. However, please note that this is not a definitive ranking, as different designs may have different priorities and trade-offs. This is based on my understanding of the information I found from web searches. Here is the ordered list:

1. Plan your PCB stackup and impedance
2. Route your high speed traces carefully
3. Floorplan your high speed PCB
4. Test and verify your high speed design

I hope this is helpful.
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