Slow performance in Linux after inserting Powerleap PL-P4/N proc adapter

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I recently upgraded an old Dell 8100 by putting in a Powerleap PL-P4/N
processor adapter (socket 423 to socket 478) and upgrading the
processor from a P4 1.33 MHz to a P4 2.6 GHz.  Under Windows, there is
a noticeable performance increase.  In Linux however, performance is
*horrible*--boot times are especially slow (~10 minutes).  It looks
like the kernel recognizes the processor, but it's still reporting
~1.33 MHz.

$ cat /proc/cpuinfo
processor    : 0
vendor_id    : GenuineIntel
cpu family    : 15
model        : 2
model name    : Intel(R) Pentium(R) 4 CPU 2.60GHz
stepping    : 9
cpu MHz        : 1296.265
cache size    : 512 KB
physical id    : 0
siblings    : 1
core id        : 0
cpu cores    : 1
apicid        : 0
initial apicid    : 0
fdiv_bug    : no
hlt_bug        : no
f00f_bug    : no
coma_bug    : no
fpu        : yes
fpu_exception    : yes
cpuid level    : 2
wp        : yes
flags        : fpu vme de pse tsc msr pae mce cx8 mtrr pge mca cmov
pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe up pebs bts
cid xtpr
bogomips    : 2726.08
clflush size    : 64
power management:

Can anyone who knows more about this suggest something else to
test/probe to help try and figure this out?


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