Pessimize

Mr. [Benjamin] Disraeli's Church appointments have been received with general satisfaction. There are two relations of the matter; the one as regards the prudence and astuteness of the dispenser of good things, and the other as relates to the general good and efficiency of the Church itself. It is equally possible to optimize and pessimize either aspect.

Source: wiktionary

pessimizing compiler [...] A compiler that produces object [...] code that is worse than the straightforward or obvious hand translation. The implication is that the compiler is actually trying to optimize the program, but through excessive cleverness is doing the opposite. A few pessimizing compilers have been written on purpose, however, as pranks or burlesques.

Source: wiktionary

Designing a window without the building, a light without the room, or a motor without the machine it drives works as badly as designing a pelican without the fish. Optimizing components in isolation tends to pessimize the whole system – and hence the bottom line.

Source: wiktionary

Thus optimizing the pipe as a component, and for just one benefit (saved pumping energy), "pessimizes" the system! Optimizing the whole system together, and for two benefits (saving energy and capital), yields fat pipes, tiny pumping equipment, slightly lower total capital cost, and 12 times less pumping energy.

Source: wiktionary