[Android Q&A, Help & Troubleshooting] anonym20:
IYes there is something else you are missing.

You have an s2, I have an s1, its not my daily phone, its my work phone.

I noticed like you that the higher version OS I used, the phone did indeed slow down.

It slowed down due to hardware limitations of the device, not the Newer OS slowing the phone, its was the phone slowing the OS down..........

In my personal experience, my s1 also drained the battery whilst on lollipop, kit kat didn't drain so much , but was very laggy, and jelly bean (4.3.1) was about the best choice between performance and stability, didn't lag but had much less in the way of tweaking options.

I also had a phone from a Korean manufacturer (huawei) that I hated the horrible ui, installing Nova over the usual ui, and after a few days the phone became laggy, froze and crashed a lot.

Now for the bad bit.

1. Are you mad?

You say you are 0% concerned about security?

HELLO!

Do you know what its like to be the victim of identity theft?

Dont you understand saying "I have nothing on my phone" is like saying there is no petrol in my car......

What about your contacts?

What about your own personal data like passwords and emails?

Your phone number?

Android constantly updates any security issues with things like this, it is very important and you should be concerned about it, not display such naivety in this nasty place of a world, someone will always try to take advantage of you or people that show no concern for their or their contacts security, believe me.

2. Again, you show no understanding and much naivety by suggesting browsing, calling and SMS are just the same app.

Let me correct you, its not.

The chrome I use on my moto e is not the same chrome that was on it before it upgraded from kit kat to lollipop, yes its a better, and improved version, but no, not the same, neither is the built in browser, the dialer or the messaging app.

You suggest you can use or replace the stock apps with 3rd party apps, yes you can, and no one or nothing can stop you doing that.......

But have you stopped for a second to consider the small fact that using Nova launcher and other 3rd party apps over the stock ones may been the cause of your problems?

Just because you have increased partition size does not mean throwing 100 apps on it will make it work faster or better than before, you are still limited by physical ram and processing speed, and I'm sure your s2 processor isn't anywhere near as fast as the processor on my moto e?

Yes you may have noticed a difference by increasing partition size but in my own experience, and reading lots other peoples experiences on here, lots of problems can be attributed to having too many apps bogging the system down, and nova is known to be a big ram hogger!

This is what crashed my Huawei

And I agree with the previous post that it may be a bad idea saying what your phone looks like is a reason or no reason to update the OS.

Its entirely up to you if you choose to update or not, no one can make that choice only you, but I fear by the nature of your post and what you have replied that you don't have that much experience and don't really know what you are talking about.

Its not my intention to offend or upset you, but you don't display the knowledge to press you argument, i suspect many here on xda will not even bother replying to you or may just laugh at you, I'm not going to lecture you, ive probably embarrassed you enough so I'll shut up.

---------- Post added at 03:10 PM ---------- Previous post was at 02:37 PM ----------

I'm sorry if my reply was harsh, I was not meant to be harsh, but I want make you realise your phones performance is not dictated by the launcher, although the launcher you use can have a dramatic effect on your phones performance.

Have you tried other launchers?

Your post doesn't say if you have, so I suggest you try holo or L launcher, something lightweight, test and report how you get on, goto play store, have a good look around, mini launcher is another one to consider.

Forget nova, let's assume Nova is your problem.

Try other launchers.

Get rid of the 3rd party apps.

All of them.

Just keep essential apps, no bloat and nothing unnecessary.

Again, test for a few days, report back.

Downgrade your android version to 4.3, again, don't install anything unnecessary and test, see how you get on.

Report your findings after a few days.

Stop advertising the fact you have an increased partition, it won't have any effect on performance and just throwing lots of apps on your newly larger partitioned storage will still bog it down.

Forget it, but its still there, its not going to have any effect on your overall performance, so don't tell anyone about it, there's no point.

Please let us know his you get on, but promise to try my suggestions first, OK?

There is a reason I said things the way I did.........

That is when I started messing around last year with my S1 and had problems with lag, crashing and various other issues, I did not research what was causing my problems, it was only the fact I had a shed load of 3rd party apps slowing my S1 down and when I posted here on xda that fact, I was made fun of and people called me stupid, I'm not suggesting you are stupid, but take time to experiment and don't assume anything, this can be sorted but only with some time and effort from you.