I was a slow eater at school and was made to sit through two dinner sittings and all of play in order to finish my meal. I can tell you now that I have no recollection of whether I ever got full throughout this ordeal, my only lasting memory is of the shame, stress and sense of failure at not being able to eat fast enough.
My 7 year old DS is slow at everything and drives me utterly insane. He also chats (and takes a looooong time to complete his conversations too) during mealtime and DS1 is very often close to finishing his meal before DS2 has even had a single mouthful. I have watched him intently to see what is taking the time and it is very bizarre and discreet. He doesn't move lethargically, he just seems to be so distracted! Shuffle about on chair, fiddle about with picking up cutlery to eat, shuffle on chair again, talk, rearrange cutlery, talk, make moves to eat, talk, shuffle on chair...
What I am currently doing is devoting a lot of energy into watching him and brightly reminding him to take a mouthful. Quite ridiculous for a 7 year old but it's him, his personality and it is necessary.
I also have to remind myself that it isn't a race. No prize for plate clearing. Very rarely do we have to finish the meal quickly because we have to be somewhere afterwards in a hurry. So, given my own terrible experience I owe him my patience.
In many ways, a slow eater is a lot more desirable than a fast eater. Think of dodgy dates with men who shovel food in ungracefully!
I, as an adult have disordered eating - bordering on Anorexia. This is to do with many parenting mistakes my father in particular made, which has left me somewhat freaky, and included him using a metre stick at the table to get me to eat, so don't panic, but, I would urge any of you with this problem to consider the profound relationship us humans have with food. It is more than just fuel as we all know that people can and do eat for comfort as well as to sustain themselves physically. Likewise, people like me deny themselves food as a method of control. I am deeply scarred by the pressure on me to eat enough, and eat it quick enough. I have a great appetite now and enjoy food and also run my own catering business. I LOVE food, but alongside that, if I am emotional and upset, worried or anxious, I use food as a way of dealing with this and I attribute this link between my eating and my emotions to the degree of emotional distress I felt when eating as a child.
Be very careful is all I am saying - even without the bitch dinner ladies and the dad with a stick, bits of damage can be done if slow eaters aren't handled carefully. Have patience everyone!
I don't think, personally that pudding should be withheld because of failure to eat at a reasonable pace. Obviously, if the child is totally larking about then there needs to be a consequence but I don't think it should be food related. I spent an Anorexicy fortnight eating only trifle once, and pudding was not allowed if I didn't meet expectations as a kid.
I do really like the idea of allowing an extra 15 mins beyond everyone else in order to finish. To be honest, as a slow eater, it can be quite nice to 'finish the mealtime' without finishing the meal iyswim and have the pressure taken away.
Minute portion sizes might help as might a meal divided into a few courses.
I think it depends how much of a child's slowness is due to silly behaviour and deliberate non-focusing on task and how much they just take their time on things in general whislt still doing what they are supposed to be.
Sorry for ramble!