Performance

Following are suggestions for improving TSO/VTAM performance:

Terminal users should stack input data whenever possible. This means using the multiple-line input technique on 3270 terminals and buffered SDLC transmission on 3767 and 3770 terminals. Stacking input results in a decreased number of data transmissions to TSO. Users of 3270 terminals can stack up to a full screen of data; 3767 and 3770 terminal users can stack from 256 bytes to 2000 bytes of data, depending on the terminal buffer size.
Users of 3767 and 3770 terminals can reduce idle time by "typing ahead." This means that whenever the terminal is not receiving data or is transmitting data, the user can enter input.
Users of 3276 and 3278 terminals can expedite unlocking the keyboard if you use BREAK mode. BREAK mode reduces idle time by allowing typing ahead.
Users of 3270 terminals can shorten the TSO/VTAM processing path when handling input if you use automatic line numbering. This reduces system overhead and expedites unlocking the keyboard.