What I expected to happen was...:
It go faster
What actually happened was...:
It went slower than the normal speed
Steps to Reproduce:
1. Put a track with almost all powered rails but add a small area that is curved off from the main track
2. Turn the powered rails on
3. Put a mine cart on and watch it go
It's probably getting slowed down by blocks placed close to the track on the curve. Please try attaching screenshots next time.