Hi,

Found this in ElementalDefs.xml...

       <TechPacingMultiplier_Epic>3.0</TechPacingMultiplier_Epic>
        <TechPacingMultiplier_Normal>1.0</TechPacingMultiplier_Normal>
        <TechPacingMultiplier_Fast>0.5</TechPacingMultiplier_Fast>

Now, Unless I am much mistaken these values are a tad off, as Epic should be the fastest, then Fast and then Normal. Also, when I look in-game with the three different settings

Reaching Refined Diplomacy, turn 1, 4 research per season takes 69590 seasons on Normal.

Reaching Refined Diplomacy, turn 1, 4 research per season takes 69590 seasons on Fast.

Reaching Refined Diplomacy, turn 1, 4 research per season takes 58975 seasons on Epic.

In conclusion, the research slider is currently broken. Research on Epic is marginally faster, and I admit I have no clue how the techpacingmultiplier is added into the game, but the values are odd. Epic is 1.17 times faster as normal and fast.