ATM10 - Pipez: Common Pitfalls
DouZZy's guide on how not to use Pipez and why upgrades can hurt performance on ATM10.
Pipez and how to not use them

Adding the fastest upgrade on a machine that doesn’t need it at all may not seem like 2 µs/t is a lot, but when you do this for another 200 pipes, it can stack quickly.