Add note about improvements only happening on v2 now #1613

Job	Run time
linux (linux.12xlarge, cpu) / linux-job	16s
linux (linux.g5.4xlarge.nvidia.gpu, cuda, 11.8) / linux-job	1s
macos (macos-12) / macos-job	13s
macos (macos-m1-12) / macos-job	22s
windows (windows.4xlarge, cpu) / windows-job	1s
windows (windows.g5.4xlarge.nvidia.gpu, cuda, 11.8) / windows-job	17s
	1m 10s

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