NK didn't make the lag... browser updates did. I suddenly got bad lag after an update.. reverted to chrome version 64, no lag again. Stop blaming devs and start finding solutions/blaming browsers :)
Lag is being caused by a chrome update. Nothing to do with the game itself. Try a different browser or roll-back chrome version to 64.0.3282.140 or earlier if you know how to get around googles BS forced updates.
Being that crazy guy from ninjakiwi.com with (almost) 3 level 100 characters, (100 heavy, 100 assault, 94 medic), it is fun to start out again. Reminds me of the good old days when I first created my heavy.
Overall a fun and entertaining game, but the balance issues get progressively worse as you level up. Still, that is mostly in your favor... if you know what you are doing.