Is this normal ? Sound from clutch pedal

Here’s something strange. I drove the car another 60 Miles today. It doesn’t matter if it’s full throttle, partial, in neutral... when the car is say 3500, if you just tap the free play in the pedal, it’s much stiffer at 2300+. I know it’s hard on the throw out bearing but it’s not like I’m pushing the clutch in enough to slip it. This is just a test. The pedal free play is much stiffer at a higher rpm. You can just rest the weight of your foot on it and when the rpms get to around 2000, your foot will sink down. Then the free play is much easier. Are there centrifugal weights inside these clutches? Without question the free play is there, but a lot stiffer. For sure the engine vibration and harmonics are coming through the clutch pedal at higher rpms because it’s stiff. Until it’s 2000 or so and the free play only takes a pinkie finger to slack. Strange.