If you sprint then sneak (while still sprinting) and hold W and D or A you can go full diagonal sprint speed while still sneaking (5.725 blocks/s).
While doing the above you can also hold jump for the same speed as sprint jumping gives, all while sneaking! Not too sure what evidence to post but hopefully mods/helpers can reproduce!
Comments 2
Thank you for your report!
We're tracking this issue in MC-152728, so this ticket is being resolved and linked as a duplicate.
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The core issue here is the fact that you're able to continue sprinting while sneaking, therefore making this a duplicate of MC-152728. This problem is more evident with the swift sneak enchantment as you can observe yourself moving at faster speeds, but the main problem here lies within the fact of how you can initially continue sprinting while sneaking.