Infocube taking huge time due to dimension design

Hi SCN Experts,

I had a cube with many dimensions but upon checking the "SAP_INFOCUBE_DESIGNS", only one of its dimension showing more than 80% of the E table (100%) . Below are the chars kept in that dimension. Can anyone suggest if we need to remove document number from the list to improve the load performance and put it as line item dimension.

Document Type

Posting Key

Item Status

Reasond Code for Payment

Document Number (GL)

line item (GL)

Number of line item within accounting document

Please let me know you new line item dimension needs to be created on this for Doc number or if any other suggestions.