Reduce memory footprint on registers and profiles

[ellykits]

Describe the feature request.
Reduce the amount of memory used by the app to hold register and profile data

Additional context
The application logs several Garbage Collection content each time a register/profile is launched. Reducing these logs would require fixing memory issues.

Acceptance criteria
Reduced number of GC logs
Expected performance gain; reducing the GC triggers

Area path
A list of ordered steps in the app on usage of the feature to support anyone testing it e.g. Code reviewer, QA e.g.

1. Login to the app
2. Open Navigation bar
3. Click on _ any register_
4. Observer quite a number of GC logs

Implementation plan (For Engineers)
Refactor Register/Default repositories to:

• Reduce the number of object allocations
• Use memory-efficient Data Structures
• Re-use singleton object etc