SAP Easy Access Screen Company Logo Bandwidth Question

We have placed our company logo on the SAP Easy Access Screen. We have users from multiple sites connecting to SAP.

Does the logo get transferred to the user each time they logon? Or is it cached on the user's PC?

I want to minimize the amount of traffic going across our WAN links. I just need to know if the logo is going across each time or if it is cached on the user end until it changes.

Please advise.