. The official Csa2 (comp.sys.apple2) Usenet newsgroup Apple II FAQs
  originate from the II Computing Apple II site, 1997-2012.

.Csa2 FAQs Resource file: R026GSEMUS.htm.
....

.                                IIgs Emu (mainly XGS) Benchmarks  (source: http://classicgaming.com/xgsdos/    Gilles Tschopp  9/1998)

Platform
Computer
OS
RAM
Cache
Av. speed
Duration
Ratio
Apple IIGS
(ROM03)
original
5 Mb
2.8Mhz
42.8s
1
XGS-DOS 0.50.2
(486 version)
Pentium 166
OS/2 Warp 4.0
32 Mb
256 Kb
3.3 Mhz
31.5s
1.35
XGS-DOS 0.50.2
(Pentium version)
Pentium 166
OS/2 Warp 4.0
32 Mb
256 Kb
4.3 Mhz
24.2s
1.76
XGS-DOS 0.50.4
Pentium 200-MMX
OS/2 Warp 4.0
64 Mb
256 Kb
6.5 Mhz
16.1s
2.65
XGS-DOS 0.50.2
(486 version)
Pentium-II 266
Win95
64 Mb
512 Kb
9.2 Mhz
11.4s
3.75
XGS-DOS 0.50.2
(Pentium version)
Pentium-II 266
Win95
64 Mb
512 Kb
9.2 Mhz
11.4s
3.75
XGS-XFREEOS/2 0.50.1
Pentium-II 300
OS/2 Warp 4.0
(Build 9.030)
64 MB
512 Kb
10.5 Mhz
10.0s
4.28
Apple IIGS
(ROM01) (2)
TransWarp 11.25 Mhz
4.25 Mb
32 Kb
11.25 Mhz
8.4s
5.09
XGS-DOS 0.50.5 (3)
Pentium-II 350
Win98
(DOS Mode)
128 Mb
512 Kb
12.6 Mhz
8.3s
5.15
KEGS-OS/2 0.37
Pentium-II 300
OS/2 Warp 4.0
(Build 9.031)
64 MB
512 Kb
15 Mhz
6.9s
6.2
Bernie v1.0 (1)
PowerPC 603e 200Mhz
MacOS 8.0
48 Mb
512 Kb
18 Mhz
3.6s
11.88