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TECO is designed to operate most efficiently when editing files that contain no more than several thousand characters per page. (TECO storage includes Q-register storage and buffer space. The size of the text storage area is dynamic and depends on the amount of available memory.) If any page of an input file is too large to fit in the text area, the TECO input commands will terminate reading that page into memory when the first line feed is encountered after a point that the buffer is 3/4 full. (See appendices for details.) You can make room by positioning the pointer past a section of text at the beginning of the buffer and moving that section out of the buffer with the commands:
0,.PW0,.K
It is sometimes advantageous to restrict the amount of the file that is present in the buffer. For example, each insert and delete command must move the entire text that is beyond the point of insertion or deletion. An operation that does many small inserts or deletes may therefore run extremely slowly if the text buffer is large. Such an operation can be sped up substantially by reading the input file with n:A commands and explicitly writing the processed text.