When I heared from my FE fellow he's going to put more than a thousand of items inside the transfer, I was astonished. My poor mind can't come up with a scene that must use a transfer with thousands of items. But I must admit, it's my mind that always not considerate enough.
Months earlier, I have built a interisting animation in transfer but it will cause reflow on many DOM elements. At that time, I hadn't think of people would insert too many data in it. Although I never compromise on style, it's hard to surpass the limit of browser and hardware. It sounds like a kind of philosophy problem to build a car as comfort as a Rolls Royce and as fast as a Ferrari (or Porsche, etc) which is nearly impossible.
(Don't tell me the Bentley Continental GT, I don't like the car looks.)
Style can't be compromised on. However, the problem need to be solved. So finally I add a boost trigger on transfer to deal with large data (by the way turn off the animation).
