ROM Confusion

[ahsanking234]

Hello Everyone,
I need to install a Custom Rom on my device. I have rooted my device and install CWM recovery. I have installed MTK Droid Roots & Tools on my PC. When I plugged in the wire, the tool detected with these details.

Hardware: MT6572 (MT6589 is Fake!)
Model: SM-G900H
Build number: ALPS.JB3.MP.V1.8
Build date UTC: 20140619-073716
Android v: 4.4.2
Baseband v: MOLY.WR8.W1315.MD.WG.MP.V4.2013/08/0710:44
Kernel v : 3.4.5 (whl@server3) (gcc version 4.6 x-google 20120106 (prerelease) (GCC) # 1 SMP Tue Jun 24 18:20:24 CST 2014
Uboot build v : ---- should be root shell
LCD Driver IC : ---- 1-nt3551_dsi_vdo

on the other screen box it says:
....> Connect to device <<<...
ATTENTION! Fake Hardware in kernel or firmware does not correspond to phone!

Now I have seen that there are custom roms for MTK 6572 and MTK 6589. But, I am not sure which one will be suitable for my device.

At the moment, the current Android Version is 4.4.2 .. My phone is very slow and laggy. I need a Rom which should make my phone fast, easy to use. Could someone help me please. I am a beginner thanks

[cookiedough]

It is very unlikely a custom ROM will help. You have MT6572, and probably 512MB RAM. There's no easy way to say this..... It's time for an upgrade. There are so many decent phones these days for less than $100. Even $50 or $60 will get you a more powerful phone.