I’ve noticed the same things from riders who corner slow or to be PC slower than they need to as in a criterium or even a mountain descent.
They don’t lay off the wheel in front and/or brake far too late. The result is slowing through the apex when faster riders are starting to accelerate. Like sprinting, lay off the wheel a touch before the corner to give you room to keep momentum and accelerate into the wheel as you exit.
They drop their inside shoulder and head to the inside of the arc. As in they seem to “lead” with the upper body or maybe they twist the upper body in the direction of the turn. It’s really weird, super unstable and always seems to result in a lost bike length at the end of the arc.
Being over geared exiting the corner results in slow acceleration which results in losing the wheel which results in needless sprinting to get back on the wheel. Shift to an easier gear or two (depending on the corner) prior to the corner.
These are the main factors I notice. 1 and 3 are easy to fix but, 2 is strange and not sure how to advise…maybe focus on keeping shoulders “in line” or parallel to your bars. It’s ok to turn your head to look towards the exit but, when you drop it to the inside it pulls your shoulders with which is slow at best and potentially pavement hitting in the wet.