[comp.windows.news] 5 times faster?

djk@cs.columbia.edu (David Kurlander) (10/10/90)

The advertisements for the newest version of OpenWindow/XNeWS claim
that it's five times faster than the last release.  Would either
someone at Sun or people that are now using the new version elaborate
on this.  Has low level imaging been sped up, or just window creation
and manipulation?

Thanks,
David
-- 
----------------------------------
David Kurlander				Department of Computer Science
djk@cs.columbia.edu			Columbia University

ks@tut.fi (Syst{ Kari) (10/11/90)

It is allways dangerous to state n times faster...  So don't take
Sun's claim (or this article) to literally.

According to my experiences X-side is significantly faster and NeWS-side is
faster (about 20%) than old release.

I also run some randomly picked benchmarks by
using 'x11perf'. I got the following results on SS1 with color disp.
  OW2 is 1.0-4.0 times faster than OW1

I also noticed that   OW2 is 1.6-3.5 times faster than MIT X11 on SS1
with color. On any other platform OW2 and MIT-X seemed to have about the same
performance.

I think the most performance inprovements are done to the olwm, which
replaces the old pswm. Unfortunately, I also lost the possibility to
configure the window manager by using postscript. Anyway, you really can
notice the performance improvement of the wm in everyday usage.

BTW: I'm still waiting for better NeWS-side. The OW2 broke several of
my NeWS-applications, especially those who used lite-toolkit. For example
my favorit terminal-window was a NeWS-application. In OW2 it is unusable
because of focus and other problems.







--
This article represents my personal views.
Quote of the year: "X is the Fortran of windowing systems."
Kari Systa, Tampere Univ. Technology, Box 527, 33101 Tampere, Finland
work: +358 31 162585      fax: +358 31 162913      home: +358 31 177412

naughton@wind.Eng.Sun.COM (Patrick Naughton) (10/12/90)

In article <1990Oct10.154744.12240@cs.columbia.edu>, djk@cs.columbia.edu
(David Kurlander) writes:
|> The advertisements for the newest version of OpenWindow/XNeWS claim
|> that it's five times faster than the last release.  Would either
|> someone at Sun or people that are now using the new version
|> elaborate
|> on this.  Has low level imaging been sped up, or just window
|> creation
|> and manipulation?
|> 
|> Thanks,
|> David
|> -- 
|> ----------------------------------
|> David Kurlander				Department of Computer Science
|> djk@cs.columbia.edu			Columbia University

Version 2 is faster than Version 1.0.1 in just about every way
imaginable.  Using x11perf and our own NeWS benchmarks, we found
increases from a few percent up to 32X improvement on SPARCstations
with dumb 8 bit color framebuffers (CG3).  GX graphics improvements
were even higher.  A fair ballpark estimate is, graphics are twice as
fast on average, and window manipulation is 5X faster.

-Patrick

--
    ______________________________________________________________________
    Patrick J. Naughton				    ARPA: naughton@sun.com
    Window Systems Group			    UUCP: ...!sun!naughton
    Sun Microsystems, Inc.			    AT&T: (415) 336 - 1080

naughton@wind.Eng.Sun.COM (Patrick Naughton) (10/12/90)

In article <KS.90Oct11094714@karikukko.tut.fi> ks@tut.fi (Syst{ Kari) writes:
>
>It is allways dangerous to state n times faster...  So don't take
>Sun's claim (or this article) to literally.
>
>According to my experiences X-side is significantly faster and NeWS-side is
>faster (about 20%) than old release.
>
>I also run some randomly picked benchmarks by
>using 'x11perf'. I got the following results on SS1 with color disp.
>  OW2 is 1.0-4.0 times faster than OW1
>
>I also noticed that   OW2 is 1.6-3.5 times faster than MIT X11 on SS1
>with color. On any other platform OW2 and MIT-X seemed to have about the same
>performance.
>
>I think the most performance inprovements are done to the olwm, which
>replaces the old pswm. Unfortunately, I also lost the possibility to
>configure the window manager by using postscript. Anyway, you really can
>notice the performance improvement of the wm in everyday usage.
>
>BTW: I'm still waiting for better NeWS-side. The OW2 broke several of
>my NeWS-applications, especially those who used lite-toolkit. For example
>my favorit terminal-window was a NeWS-application. In OW2 it is unusable
>because of focus and other problems.
>
>--
>This article represents my personal views.
>Quote of the year: "X is the Fortran of windowing systems."
>Kari Systa, Tampere Univ. Technology, Box 527, 33101 Tampere, Finland
>work: +358 31 162585      fax: +358 31 162913      home: +358 31 177412

I don't want to get into a flame war over "lies, damned lies, and
benchmarks", but I think I should clear up a few things here.  I think
it is safe to say that Sun spent thousands of person-hours working on
the performance of the X11/NeWS Version 2 server.  Although the
improvement in performance from 1.0's pswm to V2's olwm is impressive,
since x11perf uses an 'override-redirect' window, it does not test olwm
in any way. 

We worked on down-sizing and optimizing every part of OpenWindows, the
toolkits, the applications, the X11 and NeWS interpreters, the graphics
layer, and the window manager... 

I'm not sure how you arrived at your "1.0-4.0 times faster" numbers, but
here are the results I've got from x11perf comparing OW1.0 to OWV2... 
This is where I got my "few percent to 32X" figure...  I don't find it
"dangerous" to quote numbers that can be easily reproduced with a
publicly available benchmark. 

-Patrick

ps.  We realize that NeWS and X11 interaction (focus etc...) suffered at
the hands of our efforts to make our X11 implementation faster and more
"standard", and are addressing these concerns in future releases of
OpenWindows. 

----------------------------------------------------------------------
Configuration: 4/60 (SPARCstation 1), SunOS 4.1, 16M, CG3 (dumb 8 bit color)

Ratios are:
	A:  X11/NeWS Version 2 - Sun Microsystems Inc. server on unix:0.0
		divided by
	B:  X11/NeWS 1.0 - Sun Microsystems Inc. server on unix:0.0

Raw rates(ops/sec)			Ratio	Category
  A		  B
 99600.00	109000.00	   -	 0.91	Dot
 35400.00	  5340.00	  ++	 6.63	1x1 rectangle
 23000.00	  4660.00	  ++	 4.94	10x10 rectangle
  1090.00	   552.00	   +	 1.97	100x100 rectangle
    48.70	    26.40	   +	 1.84	500x500 rectangle
 13900.00	  3170.00	  ++	 4.38	1x1 stippled rectangle
  6230.00	  1790.00	  ++	 3.48	10x10 stippled rectangle
   207.00	    87.90	  ++	 2.35	100x100 stippled rectangle
    14.00	     4.20	  ++	 3.33	500x500 stippled rectangle
 11300.00	  3740.00	  ++	 3.02	1x1 opaque stippled rectangle
  6330.00	  1910.00	  ++	 3.31	10x10 opaque stippled rectangle
   357.00	    84.90	  ++	 4.20	100x100 opaque stippled rectangle
    27.60	     4.00	  ++	 6.90	500x500 opaque stippled rectangle
 11900.00	  3940.00	  ++	 3.02	1x1 4x4 tiled rectangle
  8230.00	  2430.00	  ++	 3.39	10x10 4x4 tiled rectangle
   756.00	    88.60	  ++	 8.53	100x100 4x4 tiled rectangle
    41.40	     3.80	 +++	10.89	500x500 4x4 tiled rectangle
 18000.00	  4020.00	  ++	 4.48	1x1 161x145 tiled rectangle
  6380.00	  2780.00	  ++	 2.29	10x10 161x145 tiled rectangle
   126.00	   119.00	   +	 1.06	100x100 161x145 tiled rectangle
     5.40	     5.40	   =	 1.00	500x500 161x145 tiled rectangle
 47500.00	 21200.00	  ++	 2.24	1-pixel line segment
 37300.00	 18400.00	  ++	 2.03	10-pixel line segment
 14400.00	  8270.00	   +	 1.74	100-pixel line segment
  3880.00	  2400.00	   +	 1.62	500-pixel line segment
  9420.00	  6640.00	   +	 1.42	100-pixel line segment (1 kid)
  6410.00	  5280.00	   +	 1.21	100-pixel line segment (2 kids)
  4570.00	  4220.00	   +	 1.08	100-pixel line segment (3 kids)
 18000.00	  1580.00	 +++	11.39	10-pixel dashed segment
  6270.00	   515.00	 +++	12.17	100-pixel dashed segment
  5490.00	   338.00	 +++	16.24	100-pixel double-dashed segment
 62000.00	 26700.00	  ++	 2.32	1-pixel line
 46400.00	 22600.00	  ++	 2.05	10-pixel line
 15500.00	  9020.00	   +	 1.72	100-pixel line
  3950.00	  2460.00	   +	 1.61	500-pixel line
 20200.00	  3640.00	  ++	 5.55	10-pixel dashed line
  6450.00	   642.00	 +++	10.05	100-pixel dashed line
  6230.00	   377.00	 +++	16.53	100-pixel double-dashed line
 42700.00	 21500.00	   +	 1.99	10x1 wide line
   214.00	   208.00	   +	 1.03	100x10 wide line
    77.70	    69.90	   +	 1.11	500x50 wide line
    43.30	    44.80	   -	 0.97	100x10 wide dashed line
    37.20	    38.20	   -	 0.97	100x10 wide double-dashed line
 34100.00	  1020.00	 +++	33.43	1-pixel circle
 16000.00	   768.00	 +++	20.83	10-pixel circle
   361.00	   351.00	   +	 1.03	100-pixel circle
   112.00	    68.90	   +	 1.63	500-pixel circle
   148.00	    64.10	  ++	 2.31	100-pixel dashed circle
   144.00	    48.70	  ++	 2.96	100-pixel double-dashed circle
 16000.00	   765.00	 +++	20.92	10-pixel wide circle
    75.00	    57.50	   +	 1.30	100-pixel wide circle
    21.10	    16.80	   +	 1.26	500-pixel wide circle
     8.10	     6.90	   +	 1.17	100-pixel wide dashed circle
     5.20	     4.50	   +	 1.16	100-pixel wide double-dashed circle
   529.00	   490.00	   +	 1.08	10-pixel partial circle
   370.00	   351.00	   +	 1.05	100-pixel partial circle
 32900.00	  1010.00	 +++	32.57	1-pixel solid circle
 14500.00	   715.00	 +++	20.28	10-pixel solid circle
   225.00	   224.00	   =	 1.00	100-pixel solid circle
    45.40	    22.00	  ++	 2.06	500-pixel solid circle
   407.00	   427.00	   -	 0.95	10-pixel fill chord partial circle
   238.00	   229.00	   +	 1.04	100-pixel fill chord partial circle
   389.00	   408.00	   -	 0.95	10-pixel fill slice partial circle
   220.00	   206.00	   +	 1.07	100-pixel fill slice partial circle
  3740.00	   784.00	  ++	 4.77	10-pixel ellipse
   713.00	   387.00	   +	 1.84	100-pixel ellipse
   160.00	    90.70	   +	 1.76	500-pixel ellipse
   208.00	    84.00	  ++	 2.48	100-pixel dashed ellipse
   204.00	    62.60	  ++	 3.26	100-pixel double-dashed ellipse
  3640.00	   782.00	  ++	 4.65	10-pixel wide ellipse
    78.20	    53.70	   +	 1.46	100-pixel wide ellipse
    25.10	    18.40	   +	 1.36	500-pixel wide ellipse
    10.70	     7.80	   +	 1.37	100-pixel wide dashed ellipse
     7.20	     5.60	   +	 1.29	100-pixel wide double-dashed ellipse
   484.00	   501.00	   -	 0.97	10-pixel partial ellipse
   390.00	   381.00	   +	 1.02	100-pixel partial ellipse
  4590.00	   738.00	  ++	 6.22	10-pixel filled ellipse
   774.00	   296.00	  ++	 2.61	100-pixel filled ellipse
    82.60	    37.40	  ++	 2.21	500-pixel filled ellipse
   405.00	   446.00	   -	 0.91	10-pixel fill chord partial ellipse
   302.00	   302.00	   =	 1.00	100-pixel fill chord ellipse
   393.00	   431.00	   -	 0.91	10-pixel fill slice partial ellipse
   276.00	   268.00	   +	 1.03	100-pixel fill slice ellipse
  2560.00	  2970.00	   -	 0.86	Fill 1-pixel/side triangle
  1780.00	  1950.00	   -	 0.91	Fill 10-pixel/side triangle
   328.00	   283.00	   +	 1.16	Fill 100-pixel/side triangle
  2270.00	  2290.00	   =	 0.99	Fill 10x10 trapezoid
   417.00	   331.00	   +	 1.26	Fill 100x100 trapezoid
  1400.00	  1020.00	   +	 1.37	Fill 10x10 stippled trapezoid
   129.00	    68.50	   +	 1.88	Fill 100x100 stippled trapezoid
  1480.00	  1080.00	   +	 1.37	Fill 10x10 opaque stippled trapezoid
   183.00	    66.60	  ++	 2.75	Fill 100x100 opaque stippled trapezoid
  1260.00	  1290.00	   -	 0.98	Fill 10x10 tiled trapezoid
   178.00	    70.20	  ++	 2.54	Fill 100x100 tiled trapezoid
  1360.00	  1730.00	   -	 0.79	Fill 10-pixel/side complex polygon
   293.00	   283.00	   +	 1.04	Fill 100-pixel/side complex polygons
 26600.00	 25000.00	   +	 1.06	Char in 80-char line (6x13)
 31800.00	 31200.00	   =	 1.02	Char in 80-char line (TR 10)
 11700.00	 11200.00	   +	 1.04	Char in 30-char line (TR 24)
 25800.00	 22600.00	   +	 1.14	Char in 20/40/20 line (6x13, TR 10)
 22100.00	 18200.00	   +	 1.21	Char in 80-char image line (6x13)
 25900.00	 22100.00	   +	 1.17	Char in 80-char image line (TR 10)
  8510.00	  6900.00	   +	 1.23	Char in 30-char image line (TR 24)
  1690.00	   851.00	   +	 1.99	Scroll 10x10 pixels
   316.00	   234.00	   +	 1.35	Scroll 100x100 pixels
    17.10	    14.60	   +	 1.17	Scroll 500x500 pixels
  1680.00	   819.00	  ++	 2.05	Copy 10x10 from window to window
   280.00	   126.00	  ++	 2.22	Copy 100x100 from window to window
    14.80	     5.70	  ++	 2.60	Copy 500x500 from window to window
  2170.00	  1110.00	   +	 1.95	Copy 10x10 from pixmap to window
   342.00	   173.00	   +	 1.98	Copy 100x100 from pixmap to window
    17.30	     8.40	  ++	 2.06	Copy 500x500 from pixmap to window
  1520.00	   807.00	   +	 1.88	Copy 10x10 from window to pixmap
   267.00	   125.00	  ++	 2.14	Copy 100x100 from window to pixmap
    14.70	     6.20	  ++	 2.37	Copy 500x500 from window to pixmap
  2210.00	  1010.00	  ++	 2.19	Copy 10x10 from pixmap to pixmap
   356.00	   182.00	   +	 1.96	Copy 100x100 from pixmap to pixmap
    18.90	     9.30	  ++	 2.03	Copy 500x500 from pixmap to pixmap
  1830.00	  1020.00	   +	 1.79	Copy 10x10 1-bit deep plane
   275.00	   130.00	  ++	 2.12	Copy 100x100 1-bit deep plane
    20.00	     6.70	  ++	 2.99	Copy 500x500 1-bit deep plane
  2050.00	  1350.00	   +	 1.52	PutImage 10x10 square
    65.10	    59.20	   +	 1.10	PutImage 100x100 square
     2.90	     2.60	   +	 1.12	PutImage 500x500 square
   182.00	   149.00	   +	 1.22	GetImage 10x10 square
    21.80	    21.40	   =	 1.02	GetImage 100x100 square
     0.90	     1.00	   -	 0.90	GetImage 500x500 square
 63900.00	 67700.00	   -	 0.94	X protocol NoOperation
   320.00	   310.00	   +	 1.03	GetAtomName
   314.00	   284.00	   +	 1.11	GetProperty
  5650.00	  4730.00	   +	 1.19	Change graphics context
  1450.00	   162.00	  ++	 8.95	Create and map subwindows (4 kids)
  1000.00	   219.00	  ++	 4.57	Create and map subwindows (16 kids)
  1010.00	   226.00	  ++	 4.47	Create and map subwindows (25 kids)
  1040.00	   225.00	  ++	 4.62	Create and map subwindows (50 kids)
  1040.00	   223.00	  ++	 4.66	Create and map subwindows (75 kids)
  1050.00	   216.00	  ++	 4.86	Create and map subwindows (100 kids)
  1050.00	   199.00	  ++	 5.28	Create and map subwindows (200 kids)
  1300.00	   206.00	  ++	 6.31	Create unmapped window (4 kids)
  1420.00	   392.00	  ++	 3.62	Create unmapped window (16 kids)
  1420.00	   340.00	  ++	 4.18	Create unmapped window (25 kids)
  1430.00	   350.00	  ++	 4.09	Create unmapped window (50 kids)
  1440.00	   350.00	  ++	 4.11	Create unmapped window (75 kids)
  1450.00	   344.00	  ++	 4.22	Create unmapped window (100 kids)
  1440.00	   325.00	  ++	 4.43	Create unmapped window (200 kids)
  2820.00	   551.00	  ++	 5.12	Map window via parent (4 kids)
  4550.00	  1390.00	  ++	 3.27	Map window via parent (16 kids)
  4920.00	  1440.00	  ++	 3.42	Map window via parent (25 kids)
  5270.00	  1090.00	  ++	 4.83	Map window via parent (50 kids)
  5410.00	  1050.00	  ++	 5.15	Map window via parent (75 kids)
  5490.00	  1110.00	  ++	 4.95	Map window via parent (100 kids)
  5570.00	   936.00	  ++	 5.95	Map window via parent (200 kids)
  7660.00	  1360.00	  ++	 5.63	Unmap window via parent (4 kids)
 19500.00	  1440.00	 +++	13.54	Unmap window via parent (16 kids)
 23900.00	  1550.00	 +++	15.42	Unmap window via parent (25 kids)
 29600.00	  1560.00	 +++	18.97	Unmap window via parent (50 kids)
 32100.00	  1570.00	 +++	20.45	Unmap window via parent (75 kids)
 33400.00	  1510.00	 +++	22.12	Unmap window via parent (100 kids)
 36000.00	  1230.00	 +++	29.27	Unmap window via parent (200 kids)
  1950.00	   185.00	 +++	10.54	Destroy window via parent (4 kids)
  2830.00	   264.00	 +++	10.72	Destroy window via parent (16 kids)
  3000.00	   365.00	  ++	 8.22	Destroy window via parent (25 kids)
  3150.00	   310.00	 +++	10.16	Destroy window via parent (50 kids)
  3210.00	   368.00	  ++	 8.72	Destroy window via parent (75 kids)
  3240.00	   335.00	  ++	 9.67	Destroy window via parent (100 kids)
  3280.00	   249.00	 +++	13.17	Destroy window via parent (200 kids)
   695.00	   137.00	  ++	 5.07	Hide/expose window via popup (4 kids)
  1040.00	   240.00	  ++	 4.33	Hide/expose window via popup (16 kids)
  1070.00	   239.00	  ++	 4.48	Hide/expose window via popup (25 kids)
  1080.00	   245.00	  ++	 4.41	Hide/expose window via popup (50 kids)
  1020.00	   228.00	  ++	 4.47	Hide/expose window via popup (75 kids)
   990.00	   231.00	  ++	 4.29	Hide/expose window via popup (100 kids)
   805.00	   193.00	  ++	 4.17	Hide/expose window via popup (200 kids)
   398.00	   182.00	  ++	 2.19	Move window (4 kids)
   363.00	   108.00	  ++	 3.36	Move window (16 kids)
   340.00	    78.20	  ++	 4.35	Move window (25 kids)
   297.00	    42.20	  ++	 7.04	Move window (50 kids)
   253.00	    26.10	  ++	 9.69	Move window (75 kids)
   216.00	    16.80	 +++	12.86	Move window (100 kids)
   153.00	     5.80	 +++	26.38	Move window (200 kids)
  5300.00	  2470.00	  ++	 2.15	Moved unmapped window (4 kids)
  5340.00	  2470.00	  ++	 2.16	Moved unmapped window (16 kids)
  5320.00	  2470.00	  ++	 2.15	Moved unmapped window (25 kids)
  5280.00	  2460.00	  ++	 2.15	Moved unmapped window (50 kids)
  5270.00	  2440.00	  ++	 2.16	Moved unmapped window (75 kids)
  5190.00	  2440.00	  ++	 2.13	Moved unmapped window (100 kids)
  5110.00	  2370.00	  ++	 2.16	Moved unmapped window (200 kids)
  1440.00	   789.00	   +	 1.83	Move window via parent (4 kids)
  4640.00	  1950.00	  ++	 2.38	Move window via parent (16 kids)
  6360.00	  2510.00	  ++	 2.53	Move window via parent (25 kids)
  9340.00	  3730.00	  ++	 2.50	Move window via parent (50 kids)
 11100.00	  4390.00	  ++	 2.53	Move window via parent (75 kids)
 12000.00	  4710.00	  ++	 2.55	Move window via parent (100 kids)
 14000.00	  5110.00	  ++	 2.74	Move window via parent (200 kids)
   447.00	    99.00	  ++	 4.52	Resize window (4 kids)
   425.00	    61.70	  ++	 6.89	Resize window (16 kids)
   404.00	    54.20	  ++	 7.45	Resize window (25 kids)
   344.00	    35.60	  ++	 9.66	Resize window (50 kids)
   298.00	    21.80	 +++	13.67	Resize window (75 kids)
   261.00	    17.30	 +++	15.09	Resize window (100 kids)
   179.00	     6.50	 +++	27.54	Resize window (200 kids)
  4230.00	   626.00	  ++	 6.76	Resize unmapped window (4 kids)
  4190.00	   597.00	  ++	 7.02	Resize unmapped window (16 kids)
  4160.00	   610.00	  ++	 6.82	Resize unmapped window (25 kids)
  4140.00	   602.00	  ++	 6.88	Resize unmapped window (50 kids)
  4130.00	   603.00	  ++	 6.85	Resize unmapped window (75 kids)
  4080.00	   527.00	  ++	 7.74	Resize unmapped window (100 kids)
  4040.00	   541.00	  ++	 7.47	Resize unmapped window (200 kids)
   330.00	   157.00	  ++	 2.10	Circulate window (4 kids)
   269.00	    76.00	  ++	 3.54	Circulate window (16 kids)
   261.00	   114.00	  ++	 2.29	Circulate window (25 kids)
   228.00	    85.70	  ++	 2.66	Circulate window (50 kids)
   204.00	    90.40	  ++	 2.26	Circulate window (75 kids)
   186.00	    82.80	  ++	 2.25	Circulate window (100 kids)
   148.00	    80.30	   +	 1.84	Circulate window (200 kids)
 28100.00	  7520.00	  ++	 3.74	Circulate Unmapped window (4 kids)
 28200.00	  5850.00	  ++	 4.82	Circulate Unmapped window (16 kids)
 28200.00	  4990.00	  ++	 5.65	Circulate Unmapped window (25 kids)
 28200.00	  3570.00	  ++	 7.90	Circulate Unmapped window (50 kids)
 28200.00	  2510.00	 +++	11.24	Circulate Unmapped window (75 kids)
 27800.00	  1850.00	 +++	15.03	Circulate Unmapped window (100 kids)
 28200.00	  1030.00	 +++	27.38	Circulate Unmapped window (200 kids)

Number of categories w/ -ve ratios:  14
Number of categories w/ +ve ratios: 202
Number of categories w/ equal ratios:   6

--
    ______________________________________________________________________
    Patrick J. Naughton				    ARPA: naughton@sun.com
    Window Systems Group			    UUCP: ...!sun!naughton
    Sun Microsystems, Inc.			    AT&T: (415) 336 - 1080

laukee@canon.co.uk (David Lau-Kee) (10/12/90)

djk@cs.columbia.edu (David Kurlander) writes:
>The advertisements for the newest version of OpenWindow/XNeWS claim
>that it's five times faster than the last release.  Would either
>someone at Sun or people that are now using the new version elaborate
>on this.  Has low level imaging been sped up, or just window creation
>and manipulation?

Purely subjective, so your mileage may vary...

The imaging seems to be no faster, but the window creation, etc. can be
faster.

The '5 x' claim seems a little outlandish to me, but I guess that it depends a
great deal on what hardware you've got.  On a 4/110 with CG4 and 16Mb we
noticed an improvement in speed at the window level, but on a 4/60 with CG6+GX
and 16Mb we noticed little or no improvement.  I hear from others that OW2
gains most in 8Mb environments, which I don't doubt since the server is much
smaller.
Some things slow down.  Text, for example, seems to be slower.  I think this
is an X conformance load.

I'd say that whilst switching from Sunview to OW1 gave an agonising drop in
subjective,	interactive, window-level performance, switching from SV to OW2
is merely painful, and from OW1 to OW2 could actually be quite pleasant.
Bite the bullet.  It could be worth it.

-------------
David Lau-Kee
Canon Research Centre Europe,
17/20 Frederick Sanger Rd, Surrey Research Park, Guildford, Surrey, GU25YD, UK.
NRS: laukee@uk.co.canon, INET: laukee%canon@nsfnet-relay.ac.uk
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