this happens to me all the time. I just lost a game where I had plenty of time to remove things but on mobile each pre-move takes between .2 and .5 seconds. This was a rapid game, so it’s my fault for letting the time get that low, but it makes bullet almost unplayable
Mobile App Premoves Delay

I just lost a game with .6 seconds. He had .1, I had .6 and I premoved. I'm convinced that chess.com just likes to purposely change who wins. It takes over 1 second sometimes. I've removed before every move from the beginning and the I would use twice as much time as the person I'm playing.

I just lost a game with .6 seconds. He had .1, I had .6 and I premoved. I'm convinced that chess.com just likes to purposely change who wins. It takes over 1 second sometimes. I've removed before every move from the beginning and the I would use twice as much time as the person I'm playing.
Premoves take a minimum of 0.1 seconds but can take longer if you're experiencing lag.
I wish we could do multiple premoves like on the computer version but it seems like there is a delay when doing premoves on the mobile app.