I started working for a IT company last year, and one thing i do know, with certain team members i can drop a few lines of chat regarding this or that API, and we answer each other within a minute...
Then there are those who need to do one simple task, that bottlenecks everything, and they can take up to 15-30 mins to reply, turning a task that could be done near instantly into an hour long " hurry up and wait" chore.
Pretty sure every company has the sort of employee that thinks "work from home" = answer about 3 emails and netflix.