GEO LOCATION

All We have several direct allocations from ARIN which we then provide smaller prefixes to our customers across the country. Our HQ is on the East coast, but many of our customers are on the West Coast. Trying to understand and fix some of my west coast customers GEO LOCATION issues as they are reporting for instance when running "speed tests" to Internet sites the location pops up as an East Coast server instead of West and more local. Any help would be appreciated Thank you Chris