network often end up at different times at different parts. This problem is widely known as "clock skew".

The maximum possible clock rate is capped by the logic path with the longest propagation delay, called the critical path. Because of that, the paths that may operate quickly are idle most of the time. A widely distributed clock network dissipates a lot of useful power and must run whether the circuit is receiving inputs or not. Because of this level of complexity, testing and debugging takes over