I now have a long input file with many independent sections. For the moment it is processed as follows: \starttext \startTEXpage \startMPcode % variable declarations % macro definitions with drawing code input input_data; \stopMPcode \stopTEXpage \stoptext Now this becomes a bit too large for one page, I tried a Metapost run in luatex but after taking some 12 GB of memory it gave up. The idea is thus to have one contiguous input which at certain points produces a new startTEXpage. That will flush the internal memory I guess and makes long documents possible. I'd rather not split the input_data in seperate files: making a thousand of more files seems no nice prospect to me. Any ideas how to best structure things? I should mention that I have a lot of control over the writing of the input_data. Hans van der Meer