Often, even when I hardly have any applications open, system sounds such as SMS/E-Mail ringtone come with a lag or stutter. Is anyone else experiencing the same? Is there a workaround available? Its quite bad and unimpressive!

overclocking ;-)

Overclocking is not the solution. Renicing processes is more viable. Thy this:

Edit the /etc/pulse/daemon.conf
change the value of nice level to -20 (the default is -11)
save and reboot

If you experience some shuttering after several hours, this can help:
sudo gainroot
killall pulseaudio
this may helps even without renicing pulseaudio. Hope thi help you! GOD bless you ALL!

Thanks JorgeFX, I'll try that. Just for my information, what exactly is this "nice level"? What does that mean?

On second thought, I suppose that is some sort of a priority setting for the pulseaudio process. Wondering whether there could be some way to prioritize the phone application so the screen doesn't stutter and slow down when you receive a call.

ive been having the same issue. jorge doesnt your optimise program fix this issue?

I found this: what "nice" in linux means is, how nice should this process be to other processes. its from -20 to 20. the smaller number means, pulse audio is not be nice to other processes and use its share of the cpu most! and u set it to -20 so its good for helping pulse audio run well

Yes, it is something like that. And yes, you can do that with the phone app, but I recommend not to. It is better if you tweak the transitions because the phone app problem is related to the transitions and the phone interface, not the phone app itself. With a good transition tweak you can say good bye to that problem

No, my OptimizeN900 script only helps to free memory and restart some processes including the audio process and that is the reason why you all experiment some kind of fix, but that is just because all the junk that was running and eating your ram and processor's cycles are gone and the audio process is free to run like butter

But, like I said in several post, it do NOT fix issues that NOKIA should fix!

I'm working in other scripts the tweak some things on the device, and the renice pulseaudio process I posted here is one of the things I included Be pacient. Meanwhile, GOD Bless You ALL!

pulseaudio is plain horrible!