DHJ

Further experimentation has led me to believe that only minecarts are affected by this issue, as even when boats are on blue ice or when horses have speed 10, they do not stutter when being ridden. Although the boat or horse generally travels faster than the chunks are able to load, they never stutter, despite them travelling over three times faster than a normal minecart. I’d also like to add that a minecart travelling at 8m/s should not be able to outpace chunk loading unless connection is very poor, yet this is still happening with a mobile data connection of around 25mbps.

Yes, nothing has changed for this issue with any of the updates.

Here is a video of it with normal minecart speeds - https://www.youtube.com/watch?v=StH1whb1CWo

And another when using an addon to speed up the minecarts - https://www.youtube.com/watch?v=Q1MqQbRTx_k

Also, flying or speed walking does not incur this stuttering lag at all.

I also had stuttering while riding minecarts until I began converting all unnecessary powered rails to regular rails, so try that.