You can also root your mobile by following instructions given in my POST.
If you are not satisfied with speaker volume then you can increase the volume by following instructions given in my another POST
Now our phone is much smooth and fast compare to ICS but still we want more speed.
Here are few tips which can boost our mobile and makes it lightening fast.
1. Open System Settings and Scroll Down and select to Developer Options
2. Now Enable Developer Options and Scroll Down, here you will find following options:
# Window animation scale
# Transition animation scale
# Animator duration scale
# Force GPU rendering
3. Now open Window animation scale, here you will find that it's value is "Animation scale 1x"
4. Here you have to select "Animation off"
5. Do the same with "Transition animation scale" and "Animator duration scale" and make "Animation off" for them also.
Also select a Tick on "Force GPU rendering"
Check your mobile, I am sure that you will feel lot of difference in speed, performance and smoothness.
6. Now the last step "Comment your experience here in this post".