Migrating from PB 7 to PB 12.5.2

Hello,

Iam convertingan applicationfromPB7toPB12.5.2 and this application usesDPBSERV (3-tier using proxys/TCP-IP)

The questionis: what isthe best wayto convert theapplication server?

In our testswe usewebservicesbut performanceisvery poor, about 20timesslower.

Thanks