Electrical connector includes a connector housing having a front side configured to mate with a mating connector and a mounting side configured to be mounted to a circuit board. The electrical connector also includes signal and ground conductors that extend through the connector housing between the front and mounting sides. The signal conductors form a plurality of signal pairs. The ground conductors are positioned relative to the signal pairs to form a plurality of ground-signal-signal-ground (GSSG) sub-arrays. Each GSSG sub-array includes a corresponding signal pair and first and second ground conductors that separate the corresponding signal pair from adjacent signal pairs. The electrical connector also includes a plurality of resonance-control bridges in which each resonance-control bridge electrically couples the first and second ground conductors of a corresponding GSSG sub-array. Each of the resonance-control bridges includes at least one of a capacitor or a resistor.