Suggession required on 0FI_GL_14

Hi

We are using 0FI_GL_14 for line item wise GL reporting i.e. Entry View and GL View

I am facing following issues on DEV:

1) Data loading 20million records takes 3 to 4 days

2) If parallel processes increased dead lock occurs

3) Bex query execution time in 300sec

How to resolve above issues before transporting to PRD? Because in PRD approx. 150million records.

Thanks