What is the highest total speed of a Thunderbolt connection?

The highest total speed of a Thunderbolt connection is 40 Gbps (gigabits per second), which is achieved with Thunderbolt 3 and Thunderbolt 4 standards. This speed allows for high-bandwidth data transfer and can support multiple protocols, including DisplayPort and PCI Express. Additionally, Thunderbolt 4 maintains this 40 Gbps speed while ensuring compatibility with previous versions and enhanced capabilities.