by tweaking a bit some config files, i managed to get accidentally the
'550+' fps in glxgears (and a smooth compiz) !

when i boot without configuring the network (a RT2500 pcmcia wifi card) the 
performance is good
then when i manually configure the network (iwconfig, ifconfig and route) i get 
the following messages in the log, and performance are reduced.
So the problem seems to be about IRQ20.
I continue my investigations... (i'm a beginner !)

[ 5028.636000] ADDRCONF(NETDEV_UP): wlan0: link is not ready
[ 5043.240000] irq 20: nobody cared (try booting with the "irqpoll" option)
[ 5043.240000]  [<c015b594>] __report_bad_irq+0x24/0x80
[ 5043.240000]  [<c015b852>] note_interrupt+0x262/0x2a0
[ 5043.240000]  [<c015aab0>] handle_IRQ_event+0x30/0x60
[ 5043.240000]  [<c015c23b>] handle_fasteoi_irq+0xbb/0xf0
[ 5043.240000]  [<c0106b1b>] do_IRQ+0x3b/0x70
[ 5043.240000]  [<c0105223>] common_interrupt+0x23/0x30
[ 5043.240000]  [<c013007b>] sys_capset+0x12b/0x2e0
[ 5043.240000]  [<e005099a>] acpi_processor_idle+0x24f/0x425 [processor]
[ 5043.240000]  [<e005074b>] acpi_processor_idle+0x0/0x425 [processor]
[ 5043.240000]  [<c0102413>] cpu_idle+0x53/0xe0
[ 5043.240000]  [<c03e3a85>] start_kernel+0x325/0x3b0
[ 5043.240000]  [<c03e31f0>] unknown_bootoption+0x0/0x260
[ 5043.240000]  =======================
[ 5043.240000] handlers:
[ 5043.240000] [<e00866a0>] (usb_hcd_irq+0x0/0x60 [usbcore])
[ 5043.240000] [<e04aa4a0>] (i915_driver_irq_handler+0x0/0x200 [i915])
[ 5043.240000] Disabling IRQ #20

-- 
[gutsy] performance regression with i915 xorg driver (glxgears in liveCD or 
after HD install) 
https://bugs.launchpad.net/bugs/155985
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