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- OS/2 2.0's PERFORMANCE
- ----------------------
-
- For OS/2 overall, the parameters MAXWAIT, TIMESLICE, PRIORITY,
- PRIORITY_DISK_IO, PROTECTONLY, and cache settings (in the DISKCACHE, for
- FAT, or IFS, for HPFS, lines) can be tweaked. These parameters are
- documented in the online Command Reference. The swap file should be
- placed on the most used partition on the least used hard disk. Use
- CONFIG.SYS's SWAPPATH line to control the swap file's location.
-
- FAT partitions should be periodically defragmented. A shareware
- defragmenter for DOS called DOG (Disk OrGanizer) works well. (You can
- boot DOS from a floppy disk to run such a utility.)
-
- For the Workplace Shell, drag shadows of most often used items to the
- desktop or folders closer to the "surface" -- opening folders takes
- time. Drag shadows of programs you use often (e.g. the Win-OS/2 full
- screen Program Manager) to the Startup folder. Disable animation (go to
- OS/2 System -> System Setup -> System -> Window). Use the faster
- Details View when opening drive and folder objects; to set Details View
- as the default, open the settings notebook for the object, select the
- Menu tab, click on ~Open, then the Settings button, then select the
- Default Action.
-
- Try reducing the number of on screen colors or dropping down in screen
- resolution to enhance speed. Close (not just minimize; check the Window
- List) unnecessary objects and applications. Consider adding more RAM.
-
- For DOS programs, run full screen instead of windowed if speed is
- important. In DOS Settings for each application: reduce conventional,
- XMS, DPMI, and EMS memory allocations to the bare minimum required for
- maximum performance; turn off VIDEO_RETRACE_EMULATION unless necessary;
- adjust IDLE_SENSITIVITY; turn off DOS_BACKGROUND_EXECUTION if not
- needed; change the HW_TIMER setting (particularly for games); enable
- VIDEO_FASTPASTE if possible; turn on HW_ROM_TO_RAM. Communications
- programs should use hardware handshaking where possible (use OS/2's MODE
- COMx command if necessary), and a buffered UART can prove helpful. (DOS
- programs running under OS/2 will not be aware of a buffered 16550AF
- UART. OS/2 virtualizes the serial port and manages the buffer itself.)
- For faster printing set the DOS program's output port to LPTx.OS2 (where
- x is the printer port number) -- use a "print to file" option if
- necessary. Disable any DOS print spoolers; rely on OS/2's spooler
- instead. Other, standard steps to enhance DOS performance (e.g.
- increasing BUFFERS in CONFIG.SYS) of course apply.
-
- For Windows programs, run using a full screen desktop if speed is vital.
- The Win-OS/2 Full Screen icon set up by the installation program has
- poor Settings. For better performance perform some of the same steps
- outlined in the preceding paragraph, including VIDEO_RETRACE_EMULATION
- off. The same printer output advice also applies. In addition, the
- Print Manager should be disabled (OS/2 provides a systemwide spooler).
- From the Win-OS/2 desktop close the Print Manager, uncheck the "Use
- Print Manager" box from the Win-OS/2 Control Panel -> Printers section,
- then, using a text editor, edit the \OS2\MDOS\WINOS2\SYSTEM.INI file,
- removing the ",!printman" entry from the MAVDMApps line. (This last
- step will keep a warning dialog box from appearing each time you start
- the Win-OS/2 desktop.) Consider disabling the Public setting in the
- Clipboard. If available, set VIDEO_8514A_XGA_IOTRAP to off and
- VIDEO_SWITCH_NOTIFICATION to on (unless mouse control is lost).
-
-
- -------------------------------------------------------------------------------
- Thank you for calling the OS/2 2.0 Support Line. Regarding the problem
- reported to the Support Line, we feel that this information may assist
- you in resoloving your problem. If you still require assistance, please
- call 1-800-237-5511, and reference your customer number and problem (PMR)
- number. Your Problem Record Number (PMR) should appear on the cover
- page of this faxed document.