Acq: Large Purchase Orders load very slowly

Evergreen 2.0.10
OpenSRF 2.0.1
Postgress 8.4
OS: Ubu Lucid

Large purchase orders are consistently slow to open.

A very large purchase order of 382 line items (a hotlist from a vendor) takes over 4 minutes to load. During that time the staff client stops responding and no tasks can be performed in Evergreen until the purchase order has fully loaded.

This is particularly a problem when users are linking line items from a purchase order to an invoice. Line items are linked individually from a purchase order to an invoice and the invoice opens in the same tab as the purchase order. Users have to re-open the purchase order for every line item they wish to link to the invoice.