We have found that in YBCO-Ag ceramic compounds Ag fills the intergranular space ('holes') without affecting Tc. Normal-state resistivity is decreased by approximately equals × 100 when adding up to 50 wt% Ag. Percolation analysis shows that the critical indices t,s are in agreement with 3D theoretical values, but pc is higher than expected. The critical current density Jc is enhanced by up to 50% in the samples containing approximately 10 wt% Ag, this enhancement corresponds to a maximum YBCO compactness in the samples.