It's not very significant (by most definitions of the word), a typical physics | engineering quote is:

    The electrical conductivity of copper is slightly higher at 5.96 x10^7 S/m than gold which is 4.11×10^7 S/m. More importantly is the lifespan of the two metals. Copper has a high oxidation level. So, if installed in an unstable environment (such as outside), it will fail sooner than gold.

They're close (which is how I misordered the two) with the corrosion Vs non corrosion of copper V. gold being a factor in switch contact lifespans - typically high copper alloys with lower oxidation rates are used.

Gold-plated connectors don’t oxidize- which is a benefit over copper alone.

Gold does not corrode, and can be formed into thinner parts.

And as an added bonus, copper jewelry turns your skin green!

/s