I have a map with all the feature layers in NAD_1983_StatePlane_Maryland_FIPS_1900_Feet projection...

I want to use the world street map in that map which is in WGS 1984 Coordinnate system...

I want to publish that map on arcgis server. And i get warning that becos its different projection, it will slow down the map-dsplay on the server. What is the best way to fix this?
I donot want to change projection of my layers to WGS1984

thanks a lot...