turn off vertical sync

I have the same problem. No presently available suggestions or fixes have corrected the issue. My suggestion - buy a gamepad.

Same problem here too.

I tried turning v-sync off and I'm still having the same problem :/

Yeahh I think I will just buy a gamepad, a lot simpler and hopefully it wouldn't have that odd input lag too D:

Maybe it's your graphic card?

I have the same problem. And I fiddled with graphical settings thinking it might be something like that, but that doesn't help.

also if you have an ati card set the over sampling on all the refresh rates and resolutions. i had this problem with payday 2 and it fixed it

I have nvidia card, and I tried fiddling with graphical settings in nvidia app, but that doesn't work also.

I also have this problem and have solved it. In my case, since I'm Chinese, I just turn off my Chinese input and any dictionary and input software which may monitor the screen. Then the input lag is gone. Better make sure your computer is in english input (or Latin alphabetic input?) when you play LOS. Hope it works for you guys too:P

Same here, I still haven't tried some things, but such an issue is common among action games. It may really be a crappy coding (when the controller input is emulated) or it may be a bug. I know the twitter of the main dev who made LOS https://twitter.com/CastlevaniaLOS
The issue with saves from the demo was posted there and yesterday a patch was released. So I'm going to tamper a bit with some things and if it all fails, I think we should report it as a bug.

I'll agree with Shifroval, it seems to be a prevalent problem to a lot of people so if we report it as a bug we may get some sort of fix :)

yea, same problem here too

Try windowed mode, helped for me :)

Windowed mode didn't work for me D:

So, I have the some problem...windowed mode/v-sync/english keyboard setting does't work...very frustrating...
Now I buy a gamepad...I hope this helps!!!
I'm praying for a patch...