[Galaxy S 4 General] csec:
B.3 Extra Features/Parameters:

TCP Congestion Control:

The choices in this section, address how the operating system kernel manages flows of information in and out of the kernel, which is at some level the "switchboard operator" of your handset. More info here.

Better to leave this options as is. Cubic or Westwood as the default of your kernel.

Init.d Support:

There are some scripts that run every time your device boot up which are located in /etc/init.d Those are called init.d scripts. One of the most popular init.d scirpts that is available for Note 10.1 is this.

FastCharge:

This feature makes it possible for the phone to ask for more current from USB host. So your device would be charged faster connecting to a USB host (Or USB Battery) Be aware that enabling FastCharge would block the USB access to your Phone Storage.

Dynamic FSync:

fsync is a system call in Unix/Linux. "man fsync" says:

So it's something embedded in programs after a related set of write operations to ensure that all data has been written to the storage device. The bolded part is what makes it interesting for some to disable it - "The call blocks" means the calling program waits until it's finished, and this may create lag. The downside is that if the system crashes, the data on the storage devices may be inconsistent, and you may lose data. (From here).

Dynamic FSync, makes it possible for fsync operation to be asynchronous when the screen is on, and synchronous when the screen is off. And what does asynchronous mean? Means OS issues fsync call, but not necessarily immediately at commit time for each transaction. It delays the FSync call for a certain amount of time. In case of a crash, the transactions not yet sync'ed in the last delay time before the crash may be rolled back, but the state of the data is always consistent. (From here).

MultiCore PowerSaving:

This feature try to group up tasks in the least cores possible. To put it simple, it will focus in using least cores for your tasks to be done. This means less cores are active and so more battery life. Also this will decrease performance.

•Note: To enable use TricksterMod app. 0 for disable and 2 for the most aggressive.

Special Modules:

Special modules can be available in kernel files that can be mounted and used in system. For example CIFS:

In order to manage your cifs/nfs network shares on your Android device you need the proper and working modules. And so you can mount/unmount your network accessible file resources and access your data.

zRAM:

What we need to know essentially lies here:

zRAM off = Low use data will be stored the way they are in the memory. This will cause no extra load on CPU, yet need more RAM.

zRAM on = Low use data will be stored compressed in the memory. This will cause extra load in CPU as to store or restore data, yet preserve more Free RAM.

The main use of zRAM is when you are using a heavy ROM that eats up all your RAM. This will allow multitasking to be more functional. On light ROMs, or for those who don't multitask much, this is not necessary.

Note: Also there are methods to use a part of internal memory as Swap space. This is not as fast as zRAM. But no RAM will be used at all and CPU load is less. Though I am not sure that this has been brought to our device yet. Will add more data soon on this part.

Work in progress, will add more info soon.