Performance
The original Pro ran at a speed of probably not much more than about 0.3 MIPS.  The
emulated speed varies, according to the activity being performed.  I've seen speeds
in the range of 1 MIPS (heavy screen scrolling in windowed mode) to 5 MIPS (sitting
idle in P/OS), on an 866 MHz Pentium-III machine running Red Hat Linux 8.0.

Xhomer is based on the J11 processor core from the SIMH simulator.  Profiling
various operating systems running on this core (with gprof) showed that the
simulator was spending a significant portion of its time performing virtual to
physical address translations.  In Xhomer, this translation function has been
accelerated through the use of a small cache (effectively a simple TLB), resulting
in about a 10% overall performance boost.

Following are performance benchmarks from various different host machines.  These
numbers were measured with Xhomer sitting idle at the P/OS main menu screen.

                                                                            Performance
Machine                 Processor           O/S             Compiler        (TIPS)
-------                 ---------           ---             --------        -----------
Dell Precision 370      P4-P 3.6 GHz        Linux 2.4.18    gcc 3.2         19,300
Dell PowerEdge 400SC    P4-N 2.26 GHz       Linux 2.4.24    gcc 3.2         11,000
IBM Thinkpad T41        PM-B 1.4 GHz        Linux 2.4.21    gcc 3.3.1        8,400
Apple PowerBook G4      PowerPC G4 1 GHz    Mac OS 10.3.3   gcc 3.3          4,400
Intel OR840             P3-C 666 MHz        Linux 2.4.21    gcc 3.3.1        3,700
Intel VS440FX           PPRO 150 MHz        Linux 2.2.19    gcc 3.2            800
WebPal                  ARM 710 40 MHz      Linux 2.4.18    gcc 2.95.2          30

Abbreviations:

P4-P: Pentium 4 "Prescott"
P4-N: Pentium 4 "Northwood"
P3-C: Pentium III "Coppermine"
PPRO: Pentium Pro
PM-B: Pentium M "Banias"