What is bottleneck?Common Bottleneck Hardware In Computer (2015).You wont believe what is the common bottleneck in your build that goes unnoticed from most of us and is given less concern about.In this video we discuss about what is bottleneck and how it affects performance of a computer in gaming and other software.Its always safe to build a balance build to avoid bottlenecking and to run your computer to full potential.Bottlenecking will decrease your performance and it might decrease performance by a long margin.