Thunderbolt Reference
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FAQ (2)
IDArticle TitlePost Date
1138 What is Thunderbolt 4 and is it the successor to Thunderbolt 3?Mar-01-21
1150 On my M1 Mac, the write speed to my Thunderbolt peripheral is significantly less than the read speed. Can I fix this?May-13-22
Yes, you can fix this. Connect a Thunderbolt display to the other Thunderbolt/USB 4 port. The write speeds on the first port will increase significantly (30-70% in our tests with macOS 11.3.1). Read speeds are not affected.

Why does this happen? We are not sure, but we know that an M1 Mac can support only one monitor over its pair of Thunderbolt ports, so after a monitor is connected to one Thunderbolt port, the other Thunderbolt port does not have to consider connecting to a monitor.