Primary Location selection from Web portal - Slow to display list

Hello, Can anyone tell me if there is something special I need to do in the Web portal to get the list show up quicker?

I have the Primary Location (UID_Locality) as a selection on the web portal for when employees update or create a person record.

It takes 5-10 mins and sometimes times out when bringing up the list to make a selection. I have a ticket in with support but have had not luck. 

It seems there maybe a config or setting to allow the selection to come up faster. I even looked at the Locality table for permission and set read for everyone.

Any help is appreciated I've had this ticket opened for a while and not able to get resolution.

Thank you for any help!

Lu