Factors impacting page load speed

We are experiencing some differences in page load speed (primarily on Reports) across different users and user types at my client's site. Here is our scenario:

We have connected to LDAP data via NWA and have assigned LDAP users to UME groups. These UME groups are then assigned to Application Groups in SSM Admin, and these are subsequently tied to specific Contexts.

The user in question and I are both logging in from within the company network but are in different physical locations (different states). When I VPN into the network and access SSM remotely the page load speed is the same as it is when I am on site.

Another LDAP user at the same location as the user in question experienced normal page load speed.

The user in question experienced slow page load speed from a shared PC in a conference room.

To see if we can link load speed differences to this specific LDAP user account I had the user log in as pipadmin. The load speed was much faster when logged in as pipadmin.

When I user my own LDAP user ID and compare it to the speed of pipadmin, it's the same.

Questions:

1. Should system access as a UME user be any different (faster/slower) than as an LDAP user?

2. Our administrative users are assigned to multiple UME groups. Could this impact system speed?

3. Given the circumstances described above, is it possible that the location of the user in question (i.e., the LAN at his office) has anything to do with system speed?

4. We are using ODBO to connect to BW. Would the system be faster if we switched to BAPI?

Thanks!

Laura