Is it the animation of the piece moving? I’ve tested it on a bunch of iOS devices and haven’t noticed anything odd, but I’d love to take a closer look. If you can, please share a video or GIF. It’ll really help. You can email it to me at support@offchess.com. Thanks for trying my app out and giving feedback.

Somehow today (I reached the limit yesterday) the delay has gone away, so I can’t reproduce it.

What happened, from memory:

1. Tap piece at original location

2. Tap piece at destination

3. Piece animation commences

4. Piece animation finishes

5. Move sound occurs

Everything was smooth except there was an approximately half second delay (may have been less) between 2 and 3.