Performance Improvement for loading SAIL Interface

What are the ways of minimizing time to launch SAIL Interface?

I had few observations -
--> Before launching UI there are 5-6 service calls.
--> Database insertion before launching UI.
--> 8-10 service call in SAIL interface itself.
--> Implemented Milestone functionality on UI.
--> Complex UI with around 2K lines of code.

What I tried?
--> I pulled few calls from Interface to Process model.
--> Tried parallel calls using AND and Complex gateway.

Can we implement parallel service calls using MNI(Multiple Node Instances)?
Or Is there any way that we call sub-process model Asynchronously?
Attached is the image of UI.

Any help will be appreciated! Thanks in Advance!

OriginalPostID-261291