I’m experiencing a weird “keyboard lag” is only way to describe it. hit “w” key quick, usually one step forward. When the delay happens you can hit it once there is a lag then toon moves forward a step, and if I hold it down to run forward for many steps it won’t stop. and if I hit move left or right it will do that during the run forward but not when keyed. It doesn’t always do this. Most times it is fine. My FPS is 58 and MS 30. I can take control and move with mouse but toon keeps running until it decides to stop. then i can run around fine using mouse, but if I hold a movement key down for any length of time the toon takes off again. I just bought a new keyboard and it still does it. (old keyboard felt the wrath, me believing it was a keyboard issue, rest in peace) . I have no skills and am a keyboard mover. Any ideas?
You could try a different USB port.
Could be something wrong with the one it’s currently plugged into.
edit: There’s also a new press and hold to repeat cast feature in the UI.
Maybe your system doesn’t like it
Not on the game right now and can’t recall the name of it.
Check to see if it’s on.
There’s also a dracy only feature for the empowered spells. Don’t need that on unless you are playing one.
That’s about all I can think of right now
You may also try posting here:
No idea if there’s any connection at all, but my eyes snapped to your title with an “aha!” because I’ve been experiencing something odd with keybindings and even clicking the same skill on the bar with the mouse.
It doesn’t seem to be the same skill, there’s no discernible pattern, but infrequently (thank goodness,) a skill simply won’t go, it won’t be on cooldown or have any other condition that would keep it from taking place, such as Icebound Fortitude, but tapping the key for it will not cast it. Even clicking the action bar button won’t cast it. Moving the button to a different key, such as 5, results in being able to get it to work. Moving it back to 4 and trying it will also get it to work again.
And it’s not a physical issue with my keyboard, the keys will type just fine, it’s not always the same particular key or anything. It’s just a bizarre non-responsiveness that has started happening since the last patch, if I’m not mistaken. Something I haven’t noticed for years and suddenly have experienced several times over the last week or so.
It’s perhaps all occurred on the character I’ve been playing most lately, my death knight, but I don’t think it’s related to the class, but to some new bug with the game accepting input. The fact that the keyboard won’t cast the skill and the mouse can’t activate it on the bar, either, seems to indicate that there’s some weird lag going on. But other skills can still be used with the appropriate promptness, so it’s a real puzzle as to why every so often a spell just refuses to be cast, even with repeated tries, then a minute later will go back to working fine.
I hope you find something that helps you with your movement lag. That would be even more alarming to deal with! Just wanted to say I’ve noticed some oddities with what “lag” seems the best definition for. ^.^
I was in an LFR recently where this happened to me.
I’d press the key for the spell. The toon would flinch a bit as if to start the cast animation then stop without casting the spell.
I had to keep doing /reload to get the ui to respond to key input. I assumed it was my DBM or TSM addon and on the 3rd reload I disabled all addons.
By that point I had died to mechanics. Surprised I didn’t get kicked for my 14k dps and standing in the bad until I died.
it’s lfr. you were probably one of the stronger players 
Sorry to necro this post but I was just having my own issues with this and no solution on any other forum was working. At least in my case, it turned out to be an issue with full memory usage. I wasn’t expecting it considering I have 32gigs, but as soon as I cleared some RAM up, the issue disappeared entirely. Hope this might help anyone else.
same with my laptop while eating in computer or something