For the record, the reason I'm slow is...sigh...I hate how this is gonna sound. I'm not tooting my horn, I promise.
I really, really like to put thought into what my character says and does. What they wear and how they look and present themselves is all important to me. I have a habit having a lot dialogue within poses, making my characters long winded. So I try to break that up with body language and a dash of meta? I think that's what it's called. I don't do that thing where I express their thoughts outside of speech but I will pose outside of the moment.
So I'll start a pose and realize OH! This guy would be wearing a nice suit that's rumpled. Because I have that visualization issue, I need to take a second and google up suits so I get a better idea of how to describe it. Then I'm posing until OH! He's feeling sad and closed off. So I have to think about how to describe that without him saying he's sad and doesn't want to talk. Arms crossed, shoulders drawn in, eyes away, etc. One of mine is supposed to be smarter than me. I don't make a huge deal of it but sometimes a moment comes that I need to flex. Off to Google or game books to make sure I am using the right words and terminology.
So that's why I'm slow. I'm a tryhard. The person that pulled me aside wasn't an asshole, they were kinda giving me a heads up sort of thing to keep the big combat scene moving. Because when I show up, a large scene can and has slowed because of me. I'm adapting but it is a newish thing to me.