Very poor performance on oracle linux 6.3 on virtual-box 4.2

Dear all,
I installed an oracle linux 6.3 on vbox VM (2 gb RAM, 20 gb disk): the installation took a long time and after, I faced poor performance and big latency.
One bug reported:
WARNING: at kernel/time/clockevents.c:47 clockevent_delta2ns+0x79/0x90()
Hardware name: VirtualBox
Modules linked in:
Pid: 1, comm: swapper Not tainted 2.6.39-200.24.1.el6uek.x86_64 #1
Call Trace:
[<ffffffff8106ad1f>] warn_slowpath_common+0x7f/0xc0
[<ffffffff8106ad7a>] warn_slowpath_null+0x1a/0x20
[<ffffffff8109d649>] clockevent_delta2ns+0x79/0x90
[<ffffffff819b8427>] calibrate_APIC_clock+0xeb/0x2f6
[<ffffffff819b874c>] setup_boot_APIC_clock+0x59/0x7e
[<ffffffff819b8336>] APIC_init_uniprocessor+0xfc/0x102
[<ffffffff819b60fc>] smp_sanity_check+0x69/0x145
[<ffffffff819b62fd>] native_smp_prepare_cpus+0x125/0x215
[<ffffffff819a776b>] kernel_init+0x1c9/0x2a8
[<ffffffff8150edc4>] kernel_thread_helper+0x4/0x10
[<ffffffff819a75a2>] ? parse_early_options+0x20/0x20
[<ffffffff8150edc0>] ? gs_change+0x13/0x13
I upgraded memory to 4 gb RAM but it was on vain
Please, any idea so far ?
Best Regards

I can confirm that there is no issue with Virtualbox 4.2 and Oracle Linux 6.3. I use it all the time. Performance should be near native and some aspects like disk I/O may even be faster. Your problem could be insufficient hardware, like missing x86_64 or hardware virtualization support. However, like rukbat wrote, this is not the right forum to discuss Virtualbox and your computer hardware here. I suggest to start with the Virtualbox documentation to verify your hardware is sufficient.
https://www.virtualbox.org/manual/ch10.html#hwvirt
https://www.virtualbox.org/manual/ch14.html

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