I have noticed something similar. The length of the delay appears to be correlated with the speed of my internet, so I think that what’s happening is that when you click on the ‘hand’ your browser sends a signal to the LW servers telling it what you did, and then waits for confirmation that the comment has been upvoted before coloring the ‘hand’.
I have noticed something similar. The length of the delay appears to be correlated with the speed of my internet, so I think that what’s happening is that when you click on the ‘hand’ your browser sends a signal to the LW servers telling it what you did, and then waits for confirmation that the comment has been upvoted before coloring the ‘hand’.