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I’m sorry that you haven’t been able to find the information you are looking for.
Thunderbolt 3 runs at 40 Gbps, is the fastest connection available. By comparison, native USB 3.1 operates at 10 Gbps.
Thunderbolt 3 is bi-directional with four lanes of PCI Express Gen 3 and eight lanes of DisplayPort 1.2.
You can look here:
I hope this can help.