If you get performance issue with the relative path, you should better look to the infra, this is most probably issue dute to bad network trafic, i/o contention on file server, undersized or virtual NAS or SAN with bad configuration, you'll have the same bad performance with the absolute path.
Anyway, you could bu the path(s) in a external file (txt, xls) and populate the pat in a variable during the load script in order to avoid asking QV to resolve the relative path, but I said just before the issue is somewhere else.
