Game design should minimise un-necessary mouse clicks
When upgrading champions, need to select a sacrificial: 1 click needed
but the game demands 2 confirmations, then an extra click to acknowledge upgrade, and another to return to options, which in my humble opinion could be auto at the end of the upgrading routine
Thus, the game needs 5 mouse-clicks from user where 1 could have done the job... and from lag-observations, I think one of those is communicated back and forth through internet....
What a shameful !!! waste of resources, like mice, internet, player's time & patience and last but not least: GAME SATISFACTION
There are plenty of other examples of waste in the game... just too many to quote here or I would bore you for days to come
End of my rant, sincerely, captain DGO