I routinely teach 32 - 33.
I have taught 36 (mixed year groups, as an NQT) and 34 (several times, including mixed age groups, as a trainee).
Tbh, I have never found the absolute numbers of children the main issue in terms of driving workload / classroom management. IME it has always been the classes with the widest spread of ability / needs that have generated the greatest amount of stress, and that hasn't necessarily been correlated with absolute numbers.
Those extra books to mark in every set do add up, though, so strategies for self / peer marking are really helpful, especially if - like me - you work in a school where the expectation is that every book is marked between every lesson of the same subject so there can be 4 or 5 sets in a day.
I would also say that simple things like giving out books and sheets and resources - especially as space gets really tight with extra desks - is worth thinking through, however trivial that may seem. In Covid times children have been coming straight in rather than playing outsider before school, and I have found the value of tearly-arriving child labour giving out books and sheets in the morning while the classroom is relatively empty. Having separate drawers / sets of commonly-used resources at the front and back of the classroom - or even more places if appropriate - can also be really useful to minimise children having to move around between closely-packed tables.
All of these are trivial, really - teaching 36 is, after all, just like teaching 30 - but it is those little things that I have found vital in really big classes. My classroom behaviour expectations also go up in bigger classes, and I spend longer establishing routines, not only to keep overall noise down but again because those extra children to add to the list of 'Well done X, you are quiet but Y I am still waiting for you' is cumulatively wearing.