Charging is limited by 3 factors
1. Stock charger 5 Volts, then most importantly is the Amps - 2A for typical Samsung charger so going faster then this is unlikely with the stock charger, and tablets can already charge at 1890mA so probably 90% of its rated current.
2. Cable quality and length most Samsung cables are already high-quality and have copper wires with two bigger wires for the 5v and Ground line and they are short length (3-6ft) so they can easily handle 2A output (probably higher).
3. Probably the most important is the phone / tablet, usually they have several circuitry and software (kernel) protections to limit the charging speed for several reasons since lithium-ion / poly are extremely dangerous if they are overcharged or overheated or otherwise improperly charged (you can see videos of people overcharging lithium battery's then tapping them causing a huge fireball :P)
So it is very unlikely for a cable to achieve better charging speed, it probably just has the Data + - pins shorted to tell the charger / phone to charge at full speed (though this is unnecessary nowadays since most chargers already do this, but it could be beneficial for older phones / tablets)
Last edited by otyg; 8th February 2015 at 08:42 AM.