Why is IPERF3's IPv6 speed test 1x faster than IPv4?

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Why does iperf3 Network Speed Tests (IPv6) perform faster than IPv4? What is the Geekbench 5 score higher than the Geekbench 6 score?

This is what GPT says:
There are several reasons why iperf3 may perform faster in network speed tests using IPv6:
1. Protocol efficiency
IPv6's header is more concise and removes many fields that were no longer needed in IPv4. This makes packet processing and forwarding more efficient.
2. Parallel connections
IPv6 supports more parallel connections and can better utilize bandwidth. For example, IPv6's address space is almost limitless, which allows multiple devices to connect simultaneously on a single router.
3. Path MTU discovery
Default IPv6 enables path MTU discovery, which helps avoid fragmentation, reduce delay, and improve transmission efficiency.
4. Network congestion management
In some networks, the implementation of IPv6 may be more advanced and support more advanced congestion control algorithms, thereby improving performance.
5. Network configuration
Some networks may have optimized for IPv6 by using faster routers or fewer intermediate equipment, leading to an improved performance of IPv6 tests.