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Hi @GigaYang 

• First: what is the version of you GW? R81.20 take ?
• Is Dynamic Balancing enabled?
  https://community.checkpoint.com/t5/General-Topics/R80-40-Dynamic-split-of-CoreXL/m-p/66872#M13714

The task of the SND with my (poor) words: it handles the traffic between the SND and the FW workers. (for easier understanding)

Here is a thread about packet flow:

https://community.checkpoint.com/t5/General-Topics/R81-x-Security-Gateway-Architecture-Logical-Packe...

SND

Q2:

the "small"  "i" means the outside of the incoming interface. The "big" "I" means the inside ... and so on

Q3:

There are a lot of possible scenarios. Because there are a lot of blades enabled, there can be a lot of traffic that can't  accelerated. 
Here are the sk: https://support.checkpoint.com/results/sk/sk32578

The there are rulebase issues, where the templating stopped.

You can check with fwaccel stat command:

Check this things first, before you move further.

Q4:

What do you mean here? Yes, if the dynamic balancing is enabled, the GW will do everything for the best performance.

Akos