This means they spend a lot of time on lookup,and the per-packet overhead is very high, but there is zero setup overheadfor sending a packet. Initially the tables are empty. Nowadays, it is routine for bridges to join Ethernet to Token Ring. Actually you are just to read 3.3.1 on the general strategy of cells. The IP world, in general, believes in large packets.
Cells are an important example of the merits of small packets.
At the present time, this seems unlikely to cometo pass.