Created attachment 323006 [details]
Description of problem:
Major performance issues ~10mins from grub screen to autologin! at which point the gui (kde4) is unusable, studying dmesg some things jump out at my untrained eye.
1. ACPI Error (tbfadt-0453): 32/64X address mismatch in "Pm2ControlBlock":  , using 64X 
2. MP-BIOS bug: 8254 timer not connected to IO-APIC
3. mtrr: base(0xc10b0000) is not aligned on a size(0x640000) boundary
4. APIC error on CPU0: 00(40)
Created attachment 323007 [details]
Created attachment 323008 [details]
Created attachment 323009 [details]
Created attachment 323010 [details]
This is with 32bit kde live-usb & 2x64bit system.
Can you get /proc/mtrr from an older release (that works at normal speed?)
Can you try adding:
to the kernel boot options?
Should be fixed in 184.108.40.206-100
re-spinning rawhide with 220.127.116.11-100
Success! performance is back shout if you need more info. thanks
note:acpi_skip_timer_override on F10Pre seemed to kill wireless.