Ms access application in WAN?

We database team developed a ms access database application and deployed on each district of the region.the problem is the speed of the VPN on data entry from one district to tha main server.Is ms access has a limitation on WAN network?what is the maximum size of ms access database to use on WAN.pls any comment on... show more We database team developed a ms access database application and deployed on each district of the region.the problem is the speed of the VPN on data entry from one district to tha main server.Is ms access has a limitation on WAN network?what is the maximum size of ms access database to use on WAN.pls any comment on ms access database and WAN?
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